On the last day of January, first-year students from universities all across the ENB gathered for a massive welcome event. It was an incredible opportunity to meet people from different Universities from all over Bavaria with wildly diverse academic backgrounds, ranging from immunology to economics. It was refreshing to talk to peers who are either deeply entrenched in the traditional academic path or forging entirely new ones by combining what seem to be completely unrelated fields. Ultimately, this network is designed to help you broaden your perspective, grow your social circle, and expand your opportunities in life.

GCEs receiving career advice.

During the event, we learned about the extensive benefits and opportunities that come with being part of the ENB. Beyond just academics, the network supports a well-rounded student life. There are exclusive scholarships you can apply for, language courses, and educational workshops tailored to building essential soft skills. There is even space for social gatherings, in form of sports events—like the annual football ENB cup, which GCE has been participating consistently. But the highlight that I found most fascinating? The annual meet-up where students get the chance to interact with previous Nobel Prize laureates.

As the formal presentations wrapped up, we had one last chance to walk around and put our networking skills to the test. It was the perfect time to casually chat with the speakers, fellow new members, and ENB alumni. I even took the chance to step out of my comfort zone, grab the attention of a brilliant innovator, and boldly ask her for an internship. While it might not have landed me a position this time around, I am confident I left a lasting impression—and sometimes, planting that seed is exactly what networking is all about.

Speaking to Sarah Fleidcher, Co-Founder and CEO of ToZero, a German based lethium-battery recycling company.

The benefits don’t end when the event is over. Once you’re part of the ENB, you gain lifelong access to a digital platform where you can connect with members past and present. We are highly encouraged to reach out to this community for career guidance, collaborative opportunities, or simply to make a new friend.

For those of us in the Global Change Ecology (GCE) study program, this is a massive bonus. Our field inherently needs us to look at the big picture, and the ENB allows us to step outside our specific bubble. It connects us with people walking completely different—yet equally fascinating—paths of science and life, ready to share advice, opportunities, and friendships along the way.

The post The Elite Network of Bavaria Get-Together 2026 appeared first on Global Change Ecology.

For decades, the Amazon River has defined the life, economy, and borders of the “Triple Frontier” (Colombia, Brazil, Peru). However, new hydrological measurements reveal a geomorphological shift: the Amazon’s main channel is actively migrating south, leaving the Colombian bank high and dry.

According to recent data from the Universidad Nacional de Colombia (UNAL), the deviation is no longer a slow geological process—it is an accelerated crisis. What before was a 30 %, today is only 16.9% of the Amazon River’s water flows through the Colombian channel, while the vast majority (over 83%) has diverted toward the Peruvian coast.

This is not just a story of climate change. It is a story of 20 years of overlooked science and a sudden diplomatic crisis over a new island that has literally redrawn the map: Isla Santa Rosa. 

Why is it happening? A Tale of Three Islands

To understand why this city is losing its access to the Amazon, we must look at three specific geological formations that are acting as the architects of this tragedy.

1. Isla Ronda (The Diverter): Upstream at the Nazareth Bifurcation, this massive island is the root cause. It has grown to a point where it is physically pushing the river’s main current into the southern (Peruvian) channel.
2. Isla de la Fantasía (The Wall): Located directly in front of Leticia’s port, this sediment trap has stabilized into a permanent barrier, blocking the city from the river and turning the harbor into a stagnant backwater.
3. Isla Santa Rosa (The Dispute): This is the new geopolitical dilemma. A massive formation that emerged in the river, it is now the center of a diplomatic difference between Colombia and Peru. While Colombia historically accessed the river here, the shifting channel has led Peru to claim jurisdiction over the island, increasing the isolation of Leticia.

The result is that the “port” of Leticia is increasingly becoming a stagnant backwater lagoon, accessible only by small boats during high water and completely cut off during the dry season.

The Accelerator: Climate Change and the Super-Droughts

While river meandering is a natural process, the speed of this shift is intensified by the global climate crisis. The historic droughts of 2023 and 2024, driven by intense El Niño events and Atlantic warming, lowered river levels to record minimums.

During these low-water periods, the weak current in the Colombian channel lost the hydraulic power needed to “flush” out the sediment. Sandbars that usually wash away in the rainy season have instead calcified and vegetated, turning temporary obstacles into permanent landmasses.

Implications: Beyond the Water Line

The deviation of the Amazon is not merely a logistical inconvenience; it is a systemic shock to the region’s hydrology and biology.

1. Ecological Collapse of Wetlands (The Yahuarcaca System)

The most urgent ecological threat is to the Yahuarcaca Lakes, a complex wetland system just upstream from Leticia. These lakes are not fed by rain, but by the “pulse” of the Amazon River, which recharges them via underground channels and seasonal overflow.

• The Risk: As the main channel moves to Peru, the hydraulic pressure required to fill these lakes diminishes, affecting the primary production for the local ecosystem and serving as a model for how floodplain lakes sustain the wider basin. 
• The Impact: If these lakes disconnect permanently, the primary nursery for the region’s fish populations and the hunting grounds for the endemic Pink River Dolphin (Inia geoffrensis) is lost. For indigenous communities like the Tikuna and Cocama, this is not just an environmental loss; it is the erasure of their “amphibious culture” and food security.

2. The Geopolitical Dilemma (The Moving Talweg)

The border between Colombia and Peru was fixed by the 1922 Salomón-Lozano Treaty, based on the river’s Talweg—the line of deepest flow. But rivers are dynamic, and treaties are static.

• The Question: If the deep channel permanently shifts kilometers into Peruvian territory, does the border move with it? Or does Colombia retain sovereignty over a dry riverbed?
• The Flashpoint: The emergence of Isla Santa Rosa is a symptom of this ambiguity. Peru claims it is an island in their river; Colombia claims it is part of the historic channel. This geological confusion has now escalated into a diplomatic stalemate.

Conclusion: The Point of No Return?

The tragedy of Leticia is that this hydrological change was a chronicle of a shift foretold.

Since the early 2000s, researchers from the Universidad Nacional de Colombia warned that the Amazon was behaving as an anastomosing river—a multi-channel system prone to rapid switching. They prescribed specific engineering interventions, such as submerged spurs (espolones) and strategic dredging at the Nazareth Strait, to guide the flow back to Colombia.

Those plans were ignored. Now, the region faces an unavoidable choice between two difficult paths:

1. The “Hard” Path (Geo-engineering): Attempting to reverse nature. This would require a massive, binational dredging operation and the construction of river training structures. However, the “tipping point” may have already been reached, where the sediment consolidation at Isla Ronda is so advanced that the river no longer has the energy to be redirected, making this an uphill battle.
2. The “Soft” Path (Adaptation): Accepting that Leticia is no longer a river port. This implies a radical transformation of the city’s economy, shifting away from river commerce and potentially relocating the port facilities kilometers away to a point where the channel is stable—effectively acknowledging that the river has left.

Ultimately, the Amazon teaches a humbling lesson: water does not respect political borders or human infrastructure. Whether through immediate, high-cost engineering or painful adaptation, Colombia must act. If the sediments settle, Leticia will not just be a city without a river—it will be a monument to the cost of ignoring science.

References:

• Periódico UNAL (2024). “El río Amazonas se sigue desviando hacia Perú: nueva medición muestra que hoy Colombia solo tiene el 16,9 % de sus aguas.” Universidad Nacional de Colombia.
• El País (2025). “El problema ambiental que amenaza con dejar al puerto colombiano de Leticia sin conexión al río Amazonas.” El País América Colombia.
• InfoAmazonia (2025). “La advertencia científica de hace décadas sobre el río Amazonas y Leticia que fue ignorada.”InfoAmazonia.
• La Silla Vacía (2025). “Colombia se quedó atrasado en corregir la dinámica del río Amazonas.” La Silla Vacía.
• NASA Earth Observatory (2002). “Amazon River, Leticia – Image ISS004-E-12730.” NASA Gateway to Astronaut Photography.
• BBC Future (2025). “The photos showing why pink dolphins are the Amazon’s great thieves.” (Image Credit: Thomas Peschak).
• Historia y Región (2016). “La ocupación peruana de Puerto Leticia.” (Map Reference).
• Facebook Archive. “Historical Press Release on Amazon Deviation.” (Image Reference).
• Wikimedia Commons. “Map of the Salomon-Lozano Treaty.” (Public Domain).

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During the excursion, we traveled along the Tagliamento River from its source to its confluence with the sea. Our scientific journey began in the stunning Alpine region of northern Italy and continued to the Mediterranean lagoons near Bibione. The Tagliamento is one of the last wild rivers in Europe. In some areas, the riverbed is several hundred meters wide, creating ideal conditions for dynamic sedimentation and erosion processes. The photograph illustrates the “braided river” structures and highlights the Tagliamento’s expansive riverbed. The surrounding floodplain soils are important for the rich biodiversity we observed because they provide habitats for numerous plant and animal species.

Figure 1: The “braided river” structures of the Tagliamento.

We examined the features of a natural river that has remained largely unaltered by humans. This is in stark contrast to most rivers in Germany, which have been altered and lack natural wildness. Restoring rivers like the Tagliamento could mitigate flooding problems, which are becoming more frequent in many cities due to climate change.

During the excursion days, participants could sign up for different workshops, which gave me the chance to gain experience in ornithology, zoology, botany, and hydrology. Using binoculars to observe vultures and measuring and sketching the river cross-section were valuable experiences that were completely new to me. I also enjoyed carrying out a saprobic test to assess water quality and examining water bodies for nitrate levels. A particular highlight was catching and identifying various wild bees and butterflies with an expert from the University of Salzburg.

Flower diversity

Figure 2: The common butterwort (Pinguicula vulgaris).

Then there are the bee orchid (Ophrys apifera) and the late spider orchid (Ophrys holoserica), which closely resemble each other. These orchids imitate the appearance of female bees in order to attract male bees, who then pollinate the flowers. What a fascinating example of coevolution!

Figure 3: The late spider orchid (Ophrys holoserica).

Ecological Perspective

The visit to the limestone fen near Flambro was particularly enlightening, as it is considered one of the most remarkable sites in Europe. The area is characterized by the convergence of various small-scale habitats that provide refuge for many endangered species.

The flora was impressive, but the fauna caught our attention as well. We discovered a western green lizard on the campground by chance. Later, in the Vallevecchia Nature Reserve near the Mediterranean Sea, we spotted a European pond turtle (Emys orbicularis). We even caught a common blue butterfly (Polyommatus icarus). Of course, we released it back into the wild after a few minutes.

Figure 4: The western green lizard, European pond turtle, and common blue butterfly.

Students Activities

During the excursion, students gave presentations on various topics, embodying the spirit of learning reflected by the motto, “Take all the knowledge you can get and don’t let it go.” This approach enabled us to gain in-depth knowledge in a variety of subjects. Our group of over 70 participants included students from various degree programs at several German universities, including those in Bayreuth, Tübingen, Hohenheim, Münster, and Rottenburg.

In the evenings and between activities, we discussed upcoming master’s theses, internships, and research interests. Our group of students from Bayreuth was incredible, and it was delightful to meet students from other programs and hear about their experiences.

We enjoyed an amazing picnic lunch every day, followed by a delicious pizza in the evening. To top it all off, we enjoyed the best Italian ice cream in Gemona!

Personal Impressions

This excursion was an incredible and unforgettable experience. I gained valuable insights into river systems, geology, and local flora and fauna. I also enjoyed delicious Italian food and met wonderful people who became friends during this exciting journey. I wholeheartedly recommend the Tagliamento excursion and can only praise it.

Figure 5: The riparian forest of the Tagliamento.

The post The Tagliamento – Exploring the Last Wild River in the Alps appeared first on Global Change Ecology.

This is how I start every guided tour in my job on the MS Wissenschaft: for a total of five weeks, I accompany this swimming science centre to various cities and towns in Germany and Austria. How did this happen? I already visited the MS Wissenschaft in Mainz when I was a child, and then again last year when two friends who also studied GCE and Geoecology worked on the ship. I got curious about this job, even more when I got to know this year’s topic. So, I decided to apply.

The 27 exhibits have been created by scientists themselves to present their research to the public. The exhibition is organised by Wissenschaft im Dialog (Science in Dialogue). Accordingly, I would like to enter a dialogue with you during this tour. So, what do you associate with “Future Energy”?

Entrance to the exhibition

Guided tours are my favourite task here but by far not the only one. We – a team of four students working in two-week shifts – are responsible to run the exhibition: we open for the public at 10 am (on school days already at 9), welcome visitors at the info desk, take care that the exhibits work and fix them if not, set up (and recollect) info boards out in the streets, and after closing at 18:30, we disinfect the exhibits and treat the yellow carpet with industrial vacuum cleaners before we switch off electricity.

While more than half of the electric energy produced in Germany, on average, already comes from “renewable” sources like wind or solar power, other sectors are still mostly dependent on fossil fuels. Heating and cooling, for example, have a fossil share higher than 80 percent. Most households are still heating with fossil gas or oil. Geothermal energy and electric heat pumps are the main technologies to transform this sector.

One of my favourite exhibits is the one on geothermal energy by the Helmholtz Centre for Geosciences

Yes, we also live on the ship: there are two small apartments with a comfort somewhere between a caravan and a hostel. So, I had to be ready to share a limited space and nearly all my time with people I didn’t know before, except for a two-days introductory meeting in Berlin in April. But so far, this experience has been excellent. I have only worked with nice people who have a good time together but can also rely on each other in critical moments.

Another big challenge of the energy transition is to store energy from “renewable” sources for times of high electricity demand or diverse other applications. All technologies have advantages and disadvantages. Lithium-ion batteries which we all use in our phones, for example, have a high efficiency. But they contain resources like lithium, which is currently extracted with severe environmental damages, mostly in Latin America. Therefore, researchers at the Leibniz Institute for New Materials in Saarbrücken are aiming to scale up electrochemical lithium extraction which would allow to produce or recycle lithium regionally with little environmental impacts.

On the Moselle

What I like most about working on the MS Wissenschaft is that I learn a lot – and not just about energy. I also get to know various places and people in Germany (and, in September, Austria). Without this job, I would probably never have visited the Bucher Brack nature conservation area in the Elbe floodplain, nor the water mill museum in Saarburg. The best are the passages between the stops, when we sit on deck and enjoy the view on the landscapes – and on impressive constructions like the canal bridge over the Elbe, giant sluices, and hydropower stations.

Pumped-storage hydroelectricity is a long-established technology: when excess electricity is available, water is pumped up to a reservoir. Once the energy is needed, the water can be released to power turbines. Advantages of this storage technology are its high capacity and flexibility. However, the facilities require a lot of space which means massive interventions in the landscape and its ecosystems. Nevertheless, researchers of the Fraunhofer Institute for Energy Economics and Energy System Technology are working on a new type of pumped-storage hydroelectricity, Stored Energy at Sea (StEnSea): hollow concrete spheres on the deep-sea floor with a pump-turbine to empty or fill the sphere with seawater on demand.

Several hundreds of people visit our exhibition every day. As a facilitator, I have the chance to meet people of all ages and social backgrounds: a shepherd from rural Saxony-Anhalt, the last manager of a coal mine, or the science minister of Saarland. I also learn a lot from our guests – ranging from trivial facts (for example, that windmills always turn clockwise), to their views on and experiences with the energy transition, and sometimes their entire life stories.

Hydrogen is a major topic in politics and media recently, and also in our exhibition: about one third of the exhibits is directly related to hydrogen production and use. Currently, most hydrogen in Germany is produced from fossil gas; only about 5 percent is “green hydrogen” generated with “renewable” energy through electrolysis. A lot of research focuses on scaling up this and associated technologies.

Not the least, I have the chance to apply some knowledge that I gained in my GCE studies. For example, when I had my first full conversation with a man who denied that climate change is anthropogenic, I felt very well prepared thanks to Prof. Buermann’s climatology lecture.

A disadvantage of hydrogen as an energy storage is its low efficiency: with current technologies, about half the energy invested is lost during transformations. Therefore, hydrogen is sometimes called the “Champagne” of the energy transition. Nevertheless, it can play an important role in substituting fossil fuel in processes that otherwise could hardly be decarbonised, like steel production or chemical industries.

While I overall like this job very much, the tasks are also tiresome and repetitive, and I grew very critical of the exhibition. For example, in my view, there are too many screens, and several exhibits lack comprehensive explanations. But my main critique is that the exhibition overall focuses on “technological solutions” while there is nearly no trace of energy sufficiency and the behavioural changes towards economies and societies within planetary boundaries. I believe this is the precondition for science and technology to be part of the solution to our pressing ecological crises.

Who of you has already heard of e-fuels? I’d like to finish our tour with the production of synthetic liquid fuel using the Fischer-Tropsch synthesis. This process was already invented 100 years ago to make liquid fuel from coal. Our ship, too, runs on fuel made with Fischer-Tropsch synthesis, but from fossil gas. Scientists at the Max Planck Institutes in Mülheim an der Ruhr are developing this process further to generate nearly carbon-neutral liquid fuels from “green hydrogen” and carbon dioxide. However, neither electrolysis nor carbon capture are available on large scales yet, and even if so, a lot of energy will always be lost throughout the process, making the end product highly inefficient. Therefore, we should not fall for the lies of the fossil industry that tries to promote e-fuels as a pretext to go on with their dirty businesses. For instance, it would make no sense to power private cars or heating with e-fuels because these applications can be electrified directly and, thus, more efficiently. Synthetic fuels might, however, be needed to decarbonise purposes that cannot be electrified more directly, such as aviation or ships.

The MS Wissenschaft will stop in Bamberg from August 31 to September 3, and in Nürnberg from September 4 to 7. The entrance is free. I will not be there, but my colleagues surely would be happy to welcome you. You can find more information on the website (https://ms-wissenschaft.de) and on Instagram (@mswissenschaft).

Thank you for your attention and enjoy your stay aboard!

The post MS Wissenschaft: Science Communication in a Special Place appeared first on Global Change Ecology.

Human records are also an important source of information for understanding past climates. What’s more, when climatologists and historians collaborate, they can open up a whole new field of research. For instance, historical maps and paintings can depict frozen rivers, glacier extent, and various plant species. Together, these sources paint a picture of what the climate was like in the past.

Humans as a climate witnesses:

While ice cores can provide insights into the climate of the last 800,000 years, historical data is limited to the period of human documentation. Nevertheless, it is important to gain a deeper understanding of the state of the Earth during our ancestors’ time. In Libya, for example, historians have found cave paintings of elephants, giraffes, and swimmers. These areas are deserts today, but the paintings show that the region wasn’t always so arid. A more humid climate favoring vegetation and water sources must have prevailed for people and animals to live there.

Figure 1: The deserts in northern Africa were once greener. Cave paintings from Libya often show animals that cannot survive there anymore.
Roberto D’Angelo (roberdan) – This image was originally posted to Flickr as DSCN3916

A study by Manning and Timpson (2014) supports this argument. The researchers analyzed over 1,000 bone, wood, charcoal, seed, and other plant and animal remains across the Sahara Desert. Using C14 analysis, they were able to date those findings. They located large clusters of human presence between 10,500 and 5,500 years before present (BP), indicating that the region was much more habitable at that time. This time span is known as the African Humid Period, when the Sahara was greener and had lakes and rivers.

Historical data is rarely found in the form of cave drawings. Most of the available data comes from written records and documentation, which are mostly restricted to regions with a long tradition of writing, such as Europe and Asia. Written historical documentation can take the form of logbooks or harvest records. At best, logbooks are simple descriptions of weather and wind conditions, and harvest documentation often only describes spring and summer temperature anomalies. Therefore, historical data has some limitations, but when a large amount is compiled, it can complement natural climate proxies, allowing us to reconstruct climate fairly accurately.

Although historical records have limitations, such as regional bias and incomplete data, they are still valuable supplements to natural climate proxies. When carefully compiled and interpreted, these human-made sources enrich our understanding of past climates by offering insights into environmental conditions and how societies perceived and adapted to them. Science and history form a powerful partnership in tracing Earth’s climate journey.

1. Disclaimer: This blog entry is the second part of the A Journey Through Time series ︎
2. Image taken from: García-Herrera, R., García, R. R., Prieto, M. R., Hernández, E., Gimeno, L., & Díaz, H. F. (2003). The use of Spanish historical archives to reconstruct climate variability. Bulletin of the American Meteorological Society, 84(8), 1025–1036. https://doi.org/10.1175/BAMS-84-8-1025 ︎

The post A Journey Through Time: Reconstructing Earth’s Climate from History appeared first on Global Change Ecology.

Nature as a climate witness:

Hints on earth’s past climate are hidden everywhere, we just have to know how to find and interpret them. Some of the most fascinating sources used for climate reconstruction come from the most unexpected sources. Tree rings and ice cores are natural archives which can store historical climate patterns in the form of different physical characteristics. By analysing those physical properties scientists can unveil  temperature shifts, precipitation levels and atmospheric conditions. Tree rings show us annual growth trends influenced by climate while ice traps tiny air bubbles that capture the atmospheric conditions of the earth’s past. When taking a deeper look at nature, we can find many more proxies usable for climatic reconstructions. Marine sediments, fossils, lichens, glacial features like moraines, and sedimented pollen are only a few further examples. 

The fact is that if you really want to use natural sources for climate reconstruction, you have to think outside the box and delve deeper. Using annual growth trends or ice cores as climate proxies may sound straightforward, but it’s more complex than you might think.

Let me briefly introduce you to the science behind these ice cores. As well as analysing the content of past greenhouse gases, ice cores provide layers that can be examined. Similar to tree rings, these are formed by seasonal differences in temperature or extraordinary events such as volcanic eruptions. These boundaries are clearly visible in the upper layers and can be used to determine the age of the ice. The thickness of these layers can tell us about precipitation rates and temperature, which are important climate indicators. With the help of geochemists, even deeper ice sheets can be studied. Different oxygen and hydrogen isotopes transfer climatic information.

Figure 1: An ice core drilled from the West Antarctic Ice Sheet Divide project, containing a dark layer of deposited volcanic ash Credit: H. Roop, National Science Foundation

Three common isotopes are found in Antarctic ice: H₂¹⁶O, which makes up almost 99.7% of the precipitated snow, and two rarer ones: H₂¹⁸O and D₂¹⁶O. Changes in the concentration of these isotopes indicate changes in temperature because the proportion of H₂¹⁸O and D₂¹⁶O is linearly and consistently related to temperature in Antarctica. During colder periods, the H₂¹⁶O content of ice is higher. As the climate warms, the proportion of H₂¹⁸O in Antarctic ice cores and the proportion of H₂¹⁶O in oceans increases. The same reasoning can therefore be applied to the analysis of foraminifera, which are shelled microorganisms which trap oxygen in their shells as they form.

1. Disclaimer: This blog entry is the first part of the A Journey Through Time series. ︎
2. Image taken from: https://www.ncei.noaa.gov/news/what-are-proxy-data ︎

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After facing each other in last year’s quarter-finals, this year’s team consisted not only of GCE alumni and spectators, but also members of the Bayreuth-based elite study programme ‘Scientific Computing’. Thanks to Vroni, they were able to organise and design a beautiful set of jerseys. All in all, there were around 20 of us.

Building on last year’s positive performance, we practised a few times beforehand with the clear aim of forming a team, devising a tactical game plan and, of course, practising penalties. As with last year, we finalised our tactical adjustments on the train to Munich. On 14 June, we were blessed with a sunny day, hinting at a warm summer to come.

Our tournament began with two consecutive games, which constituted our entire group phase. Each game lasted 15 minutes and was played with six players and a goalkeeper. We had a rough start to the first game, as we didn’t have a proper warm-up and were up against a very physical team consisting mainly of grown men. We ended up losing 2–0, which was disappointing.

With little time to adjust our game plan, we faced our next opponents. Once again, we really struggled to find our rhythm, but we managed to win 1–0 thanks to a penalty scored by Mateo and won by JC. Although we had reached our target of advancing to the quarter-finals, we were disappointed with our performance. After this short but intense playing session, we had a longer break which included lunch.

After the lunch break, we played our quarter-final. Within the first three minutes, we managed to take the lead thanks to another penalty, which was both drawn and scored by Mateo. After that, it was a hard-fought match, but this time we were able to fight back, with our defence mainly occupied with defending against the opponent’s top striker. At the same time, we kept pushing and, with a beautiful long shot, we scored our second goal. In the final minutes, we focused on not conceding any goals. Ultimately, we limited our opponents to one shot on goal, and we were pleased with both the result and our mentality on the pitch. This was the first time we felt like we were in the tournament.

We reached the stage where we lost last year: the semi-finals. During the semi-final, our opponents put us under a lot of pressure and we were unable to make any offensive moves. Nevertheless, we tried to hold on to the 0–0 draw, bearing in mind that we had practised penalties beforehand. However, with a beautiful move and literally in the last second, our opponents scored, sending us to the lower bracket.

This was a blow for all of us, and we only faced our next opponent after a short break. We ended up losing 3:1. Our goal was scored beautifully following a long throw-in by Vroni. By this point, we had already exceeded the expected tournament time, and we were exhausted from spending hours in the bright sun. This is why we were all kind of happy to be out of the tournament, knowing that we had a long train ride ahead of us. On the other hand, there was also a sense of having missed an opportunity. In the end, we all had a nice day in Munich, and we arrived in Bayreuth at around 9 pm, which was fine too.

We hope to continue joining forces with the Scientific Computing Programme next year. With some minor adjustments and some of our missing players joining, we are confident that we can still dream of winning the ENB Cup.

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As part of the comprehensive course Natural Climate and Human Impacts on Climate, given by Professor Dr. Wolfgang Buermann of the University of Augsburg, this series of entries are a compilation of a seminar on the fundamental mechanisms of planetary climate, methods for reconstructing past climates, current consequences of global climate change, and other relevant topics.¹

What is driving the observed vegetation dynamics?

A complex interplay of biophysical and anthropogenic drivers shapes vegetation dynamics across the globe. Several key factors contribute to observable changes in vegetation patterns, growth rates, and ecosystem composition. The most significant drivers include climate change, CO₂ fertilization, changes in land use, nitrogen deposition, and natural or human-caused disturbances.

Climate change alters the structure and functioning of ecosystems by extending growing seasons, shifting ecological zones, and increasing drought stress. These changes impact regions differently, influencing both productivity and vegetation resilience.

CO₂ fertilization enhances photosynthesis and plant growth, particularly in temperate regions where water and nutrients support this physiological response. While this effect may temporarily increase biomass, its long-term sustainability is uncertain.

Changes in land use, such as deforestation, agricultural expansion, and afforestation, directly alter vegetation cover. Deforestation contributes to vegetation loss and carbon emissions, whereas afforestation and agricultural land management can result in localized increases in greening.

Nitrogen deposition, largely resulting from industrial and agricultural activities, can stimulate plant growth by enriching the soil with nutrients. However, excessive nitrogen input can disrupt the balance of ecosystems and reduce biodiversity, leading to unintended ecological consequences.

Disturbances such as wildfires, pest outbreaks, and disease events increasingly affect vegetation dynamics. These disturbances result in direct vegetation loss and alter successional trajectories and species composition.

Figure 2: Attribution of Trends in Growing Season Mean Leaf Area Index
(a) Trends in global-averaged leaf area index (LAI), derived from satellite observations (OBS), attributed to rising CO₂ (CO₂), climate change (CLI), nitrogen deposition (NDE), and land cover change (LCC) from 1982 to 2009 (Ref. 11).) (b) Contribution of different drivers to LAI change in latitude bands (>50°N, 25–50°N, 25°S–25°N, and >25°S) (c) Spatial distribution of the dominant driver of growing season mean LAI trend, defined as the driver that contributes most to the increase or decrease in LAI in each vegetated grid cell.

Ramifications

Global greening has measurable impacts on climate systems, the carbon and water cycles, and human activity. It enhances photosynthesis, thereby increasing plant productivity and carbon uptake. According to satellite data and Earth System Models (ESMs), this terrestrial carbon sink offsets approximately 29% of anthropogenic CO₂ emissions, equaling about 2.5 ± 1.0 petagrams of carbon annually. Additionally, seasonal CO₂ patterns have shifted, with earlier spring uptake and autumn release in the Northern Hemisphere, indicating changes in the timing of carbon exchange.

Greening intensifies evapotranspiration (ET), which increases the transfer of water vapor from the land to the atmosphere. This can reduce local soil moisture and runoff, raising the risk of drought, though it may also increase precipitation downwind. Early-season greening can deplete soil moisture before summer, which suppresses vegetation growth and increases the likelihood of heat waves.

Temperature effects vary regionally. Increased ET cools the land surface; however, greener vegetation lowers albedo, absorbing more sunlight and warming the surface. The global net effect is modest cooling, though the balance between these forces varies by location.

Socially, greening can support agriculture by extending the growing season and increasing biomass. However, reduced water availability and greater climate variability may threaten food security in vulnerable regions. These interconnected effects underscore the importance of viewing greening not only as an indicator of ecosystem health, but also as a catalyst for complex environmental and socioeconomic change.

Global greening is a powerful indicator of how vegetation dynamics are reshaping Earth’s systems. Yet, the full scope of its long-term consequences remains uncertain. As vegetation patterns shift in response to climate, land use, and atmospheric changes, so too do the feedbacks that influence global temperature, water availability, and ecosystem stability. Continued research and improved monitoring are essential to deepen our understanding. Importantly, integrating vegetation data into climate policy and land management strategies can help guide adaptive responses—supporting sustainable agriculture, biodiversity conservation, and carbon mitigation efforts in a rapidly changing world.

References

1. Chen, C., Park, T., Wang, X. et al. (2019) China and India lead in greening of the world through land-use management. Nat Sustain 2, 122–129. https://doi.org/10.1038/s41893-019-0220-7
2. Gaspard, A.; Simard, M.; Boudreau, S. (2023) Patterns and Drivers of Change in the Normalized Difference Vegetation Index in Nunavik (Québec, Canada) over the Period 1984–2020. Atmosphere 2023, 14, 1115. https://doi.org/10.3390/atmos14071115
3. Piao, S., Wang, X., Park, T. et al. (2020) Characteristics, drivers and feedbacks of global greening. Nat Rev Earth Environ 1, 14–27. https://doi.org/10.1038/s43017-019-0001-x
4. Wang JA, Sulla-Menashe D, Woodcock CE, Sonnentag O, Keeling RF, Friedl MA. (2020) Extensive land cover change across Arctic–Boreal Northwestern North America from disturbance and climate forcing. Glob Change Biol. 2020; 26: 807–822. https://doi.org/10.1111/gcb.14804

1. Header image taken from: https://www.wikiwand.com/en/articles/vegetation ︎

The post Academic Series: The Science Behind Vegetation Dynamics (part II) appeared first on Global Change Ecology.

How do we observe global changes in the vegetation cover of the planet?

This question is covered by a relatively new area of climate research that seeks to understand how plants respond to rising temperatures, shifting weather patterns, and changes in atmospheric composition caused by global climate change.

Since 1981, technology has given us the ability to observe global vegetation, when the Advanced Very High Resolution Radiometer (AVHRR) was installed on the NOAA-N spacecraft. This sensor could take pictures of the Earth beyond the visible spectrum; it was highly sensitive to near infrared, but could not sense the blue range. More advanced sensors, such as MODIS, added the blue range to the picture.

The collected data is analyzed using indices. The two most popular indices are the Normalized Difference Vegetation Index (NDVI) and the Leaf Area Index (LAI). The NDVI shows the ratio of the difference between the amount of light reflected and absorbed in the near-infrared and visible spectra. Healthy green foliage absorbs most of the visible spectrum and reflects more than half of the infrared spectrum. The higher the NDVI index, the greener the surface. LAI measures vegetation density by comparing total one-sided leaf surface area to ground area covered (m²/m²). Monitoring helps track vegetation trends, estimate evapotranspiration, and forecast agricultural yields.

Several important metrics are commonly used to assess vegetation dynamics and ecosystem responses. These include SOS (Start of the Growing Season), which marks the beginning of active plant growth, and EOS (End of the Growing Season), which indicates the decline of vegetation activity. LOS (Length of the Growing Season) represents the duration between SOS and EOS and provides insight into seasonal shifts influenced by climate change.

Primary productivity, measured as gross primary productivity (GPP) and net primary productivity (NPP), reflects the overall carbon uptake by plants. GPP refers to the total amount of carbon fixed through photosynthesis, and NPP represents the portion remaining after respiration, serving as an indicator of biomass accumulation and ecosystem productivity.

What do we observe in vegetation dynamics?

Although data obtained earlier from the AVHRR sensor may be less ideal for long-term analysis due to internal limitations, calibration in combination with data from more modern sensors clearly shows a distinct global greening trend since at least the 1980s. Piao et al.’s study³ indicates that, from the 1980s to the 2010s, leaf area increased by 5.4 million km², equivalent to the area of the Amazon rainforest.

However, trends vary when scaled. In certain regions, reverse dynamics, or browning, may be observed. It is also possible to identify greening hotspots. Seasonal shifts are also observed. The growing season is starting earlier and ending later, effectively extending its duration. Peak greenness is occurring earlier and becoming more pronounced. Seasonal patterns of vegetation greenness are shifting. High-latitude regions are showing reduced seasonality, with patterns similar to those of regions farther south in the past. The start and end of the growing season are moving northward faster than peak greenness. These changes have implications for the agricultural sector and ecosystems, which will be explored in the following sections.

Greening Hotspots

China and India have emerged as key contributors to global greening, albeit through different pathways. In China, 42% of the greening is attributed to forests, while 32% is attributed to croplands. This greening has been driven by large-scale afforestation and reforestation programs, which have increased forest cover, reduced land degradation, and enhanced carbon sequestration. However, these efforts have also placed additional pressure on water resources. Meanwhile, agricultural productivity rose by 43% from 2000 to 2016, supported by multiple cropping, irrigation systems, and intensive fertilizer use. In contrast, 82% of India’s greening is cropland-based, with only 4% stemming from forests. This trend is largely the result of agricultural intensification, which led to a 26% increase in cereal production over the same period through expanded cultivation areas and intensified farming practices, similar to China’s approach.

In the case of Arctic regions experiencing greening, agricultural fields and afforested territories are no longer the main contributors. In these regions, vegetation covers the land due to natural growth, primarily through shrubbery. Gaspard et al. refer to this phenomenon as “shrubification.” In their study, the methodology included working with indices, overlaying vegetation maps, and mapping the types of cover and surface deposits in the studied region using ecological models. This allowed the authors to determine the role of plant communities and zonal dynamics in the observed phenomenon.

Recent greening trends in the Arctic and boreal regions reveal significant changes in land cover. Currently, approximately 13.6% of the region has experienced land cover change, and if this pace continues, the entire area could transform within 200 years. In boreal forests, the net loss of evergreen cover coincides with an increasingly active fire regime. In Arctic areas, the gradual expansion of shrubs is more difficult to detect, yet it contributes to the overall greening. Additionally, there has been southern herbaceous growth, primarily driven by extensive agriculture in regions such as Alberta and British Columbia. However, this gain is largely seasonal and linked to agricultural cycles. It should not be interpreted as a long-term ecological shift, such as the more persistent vegetation changes occurring in the Arctic.

Please, stay tuned to know more about what drives vegetation dynamics and what are its ramifications.

1. This is the first entry on the series ︎
2. Header image taken from: https://mpimet.mpg.de/en/research/independent-research-group/climate-vegetation-dynamics ︎
3. Piao, S., Wang, X., Park, T. et al. Characteristics, drivers and feedbacks of global greening. Nat Rev Earth Environ 1, 14–27 (2020). https://doi.org/10.1038/s43017-019-0001-x ︎
4. Statistically significant trends (P ≤ 0.1, Mann–Kendall test) are color-coded. Gray areas depict vegetated land with statistically insignificant trends. White areas depict barren land, permanent ice-covered areas, permanent wetlands, and built-up areas. Blue areas represent water. The inset shows the frequency distribution of statistically significant trends. The red circles highlight the greening areas, which mostly overlap with croplands except for circle number 4. Similar patterns are seen at P ≤ 0.05, and the seven greening clusters are visible at P ≤ 0.01. ︎

The post Academic Series: The Science Behind Vegetation Dynamics appeared first on Global Change Ecology.

With an academic with a background in Environmental Sciences and currently pursuing my Master’s in Global Change Ecology – where I study the complex interactions between climate, ecosystems, and policy – I used to think that simply providing more information would help everyone agree on pressing issues like climate change, biodiversity loss, and sustainability. Yet, despite overwhelming research and facts, many people still aren’t aware of—or can’t access—this knowledge. So, how do we bridge the gap between research and real-world impact?

First, let us look at the ones who are not aware. It wasn’t until recently, when I attended a science communication course, that I realized how often we academics are stuck in our bubble, thinking things like “Ah, everyone knows what climate change is!” But is that true? According to a climate opinion survey conducted by the Yale Program on Climate Change Communication in 31 countries, four out of ten people had never heard of climate change before. In many parts of the Global South, people are unaware of climate change and do not understand it is human-caused. As a result, there isn’t enough public demand to pressure political parties to take action.

So, how do you do that? As with most things, there isn’t a “one-size-fits-all” solution, but here are a few pointers that can help if you aim to build a bridge between science and society:

1. Target the right audience – Who do you want to communicate with? Do you have a specific age group or working group in mind? The more specific you can be about your audience, the more strategic—and relatable—your content can become. Remember: when you try to target everyone, you end up reaching no one.
2. Don’t just preach—listen! – We often assume that simply presenting all the information we have will solve the problem. But would you believe a friend who says, “Starbucks makes the best coffee in the world”? Probably not. However, if that friend said, “I’ve heard Starbucks might have the best coffee—do you want to try it with me and see if that’s true?” then you’d be more open to giving it a shot. This kind of relationship-building is important when communicating about topics like climate change. Stay humble, and don’t try to change someone’s entire worldview in one go. Would you like it if someone imposed their beliefs on you without understanding your perspective?
3. Make it personal – We all relate to things better when there is a personal experience involved. This approach is also helpful when you’re creating content that you want to have a meaningful impact on the people it’s intended for.
4. Be realistic, focused, and engaging – I’ve often found myself starting with one topic in mind, then realizing halfway through that it’s morphing into something completely different by the end. Don’t do this! Have a clear structure from the start. Stay realistic, remain focused, and sprinkle in anecdotes that your audience can relate to.
5. Everyone loves visuals – “A picture is worth a thousand words,” and we all know the power of visuals, whether it’s a graph or a scientific cartoon.

For me, it wasn’t easy as an academic to bridge this gap, and it certainly takes time. But nobody is perfect and you have got to start somewhere. With practice you will get better! Picture a specific person you’d like to talk to about your topic, and keep them in mind while writing. Don’t give up—play around with these tips and tricks to see what works best for you!

This Blog entry was Edited by: Dr. Laura Sommer

Source to header image: https://sites.rutgers.edu/scipolru/resources/science-communication/

The post Science Communication Done Right! – Bridging the Gap Between Academia and Society appeared first on Global Change Ecology.