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Sea level rise: West Antarctic ice collapse may be prevented by snowing ocean water onto it

18/07/2019 - The ice sheet covering West Antarctica is at risk of sliding off into the ocean. While further ice-sheet destabilisation in other parts of the continent may be limited by a reduction of greenhouse gas emissions, the slow, yet inexorable loss of West Antarctic ice is likely to continue even after climate warming is stabilised. A collapse might take hundreds of years but will raise sea levels worldwide by more than three meters. A team of researchers from the Potsdam Institute for Climate Impact Research (PIK) is now scrutinising a daring way of stabilising the ice sheet: Generating trillions of tons of additional snowfall by pumping ocean water onto the glaciers and distributing it with snow canons. This would mean unprecedented engineering efforts and a substantial environmental hazard in one of the world’s last pristine regions – to prevent long-term sea level rise for some of the world’s most densely populated areas along coastlines from the US to China.

Environment Council presents new special report on the legimitimacy of environmental policy

27.06.2019 - In its new special report, the German Advisory Council on the Environment (SRU) discusses the legitimacy of environmental policy and proposes institutional developments for policy and administration. The 300-page paper is entitled "Democratic governance within ecological boundaries - on the legimitation of environmental policy". Against the background of long-term and systemic environmental problems, the members explain how a the state is not only legitimised to act but also obliged, to preserve people's livelihoods. The report was presented to Federal Environment Minister Svenja Schulze in Berlin.

"Heat waves are on the rise": PIK statement

24/06/2019 - Germany likely faces a heat wave this week. In which way is this releated to human-caused climate change?

CO2-pricing: German chancellor Angela Merkel visited PIK for a scientific briefing

14/06/2019 - For more than two hours, German Chancellor Angela Merkel visited the Potsdam Institute for Climate Impact Research (PIK) last Thursday, June 13th, to discuss climate change and climate policy with Director Ottmar Edenhofer and other researchers. A special focus of the meeting lay on options for an effective and fair CO2 pricing. Besides Mrs Merkel, Minister of State to the Federal Chancellor, Helge Braun, spokesman State Secretary Steffen Seibert and experts from the Chancellery also took part. A good two dozen researchers from all research departments at PIK were involved in the round table discussion taking place the Great Cupola of PIK's historic Michelson building and presented research results on climate risks and possible solutions for the climate crisis.

Lucht at meeting of all CDU/CSU parliamentary group leaders

06/04/2019 - The German conservative party CDU/CSU is re-thinking climate policy. The elected representatives invited experts Wolfgang Lucht from the Potsdam Institute for Climate Impact Research and Patrick Graichen from the Agora Energiewende to the two-day conference of all parliamentary group chairmen - from the state parliaments in the German "Länder" to the federal level in the Bundestag and the European Parliament - this week in Weimar. They discussed risks of human-made global warming, from extreme weather events to changing our landscapes, as well as the possibilities for an effective reduction of greenhouse gas emissions. The conference was also attended by German Chancellor Angela Merkel and Bavarian Prime Minister Markus Söder.

Summer extremes of 2018 linked to stalled giant waves in jet stream

29/04/2019 - Record breaking heatwaves and droughts in North America and Western Europe, torrential rainfalls and floods in South-East Europe and Japan - the summer of 2018 brought a series of extreme weather events that occurred almost simultaneously around the Northern Hemisphere in June and July. These extremes had something in common, a new study by an international team of climate researchers now finds: the events were connected by a newly identified pattern of the jet stream encircling the Earth. The jet stream formed a stalled wave pattern in the atmosphere which made weather conditions more persistent and thus extreme in the affected regions. The same pattern also occurred during European heat waves in 2015, 2006 and 2003, which rank among the most extreme heatwaves ever recorded. In recent years, the scientists observed a clear increase of these patterns.

Dutch royal couple visits Telegrafenberg

05/22/2019 - King Willem-Alexander and Queen Máxima of the Netherlands visited the Albert Einstein Science Park on Potsdam's Telegrafenberg during their stay in the State of Brandenburg today. In the presence of Brandenburgs Prime Minister Dietmar Woidke and Minister of Science Martina Münch, the Potsdam Institute for Climate Impact Research (PIK) and the GeoResearchCenter (GFZ) signed cooperation agreements with Vrije Universiteit Amsterdam and TU Delft. The agreements are on geothermal research and research on weather extremes.

The Long Night of the Sciences at PIK

20/05/2019 - In a few weeks, over 60 scientific institutions will be opening their doors to the public all across Berlin and Potsdam-Telegrafenberg. On June 15th from 17-24h, events will cover the natural sciences, engineering, social and cultural studies, medicine and much more. Whether it’s in lectures, science shows or in hands-on experiments, there is much to discover and to learn at the Long Night of the Sciences. Here is some information on the programme at the Potsdam Institute for Climate Impact Research (PIK):

Stefan Rahmstorf receives ZEIT Wissen prize “Courage for Sustainability”

09/04/2019 – Stefan Rahmstorf has been awarded the "ZEIT Wissen-Prize 'Mut zur Nachhaltigkeit' – Encouraging Sustainability" for his achievements in communicating climate change. With this award, the magazine of the ZEIT publishing group honours pioneers from science, industry, and civil society, who contribute outstandingly to closing the gap between knowledge and action in the area of sustainable development. The prize is endowed with 10,000 euros.

More CO2 than ever before in 3 million years, shows unprecedented computer simulation

03/04/2019 - CO2 greenhouse gas amounts in the atmosphere are likely higher today than ever before in the past 3 million years. For the first time, a team of scientists succeeded to do a computer simulation that fits ocean floor sediment data of climate evolution over this period of time. Ice age onset, hence the start of the glacial cycles from cold to warm and back, the study reveals, was mainly triggered by a decrease of CO2-levels. Yet today, it is the increase of greenhouse gases due to the burning of fossil fuels that is fundamentally changing our planet, the analysis further confirms. Global mean temperatures never exceeded the preindustrial levels by more than 2 degrees Celsius in the past 3 million years, the study shows – while current climate policy inaction, if continued, would exceed the 2 degrees limit already in the next 50 years.

Greta Thunberg visits PIK at Telegrafenberg-Campus

03.04.2019 - Greta Thunberg, the 16-year-old climate activist from Sweden recently visited the Potsdam Institute for Climate Impact Research (PIK). Thunberg and Luisa Neubauer, the 22-year-old activist of the German „Fridays for Future“-Movement, met with the Directors Johan Rockström and Ottmar Edenhofer and other experts from PIK. They discussed topics like the Paris Agreement and the latest insights from climate science and talked with scientists like Ricarda Winkelmann, Stefan Rahmstorf or Jessica Strefler, as well as PIK Director Emeritus Hans Joachim Schellnhuber, about their research at the institute.

Amazon forest can be trained by higher rainfall variability – but may be no match for climate change

25.02.2019 - The Amazon rainforest has evolved over millions of years and even through ice ages. Yet today, human influences and global climate change put this huge ecosystem at risk of large-scale dieback – with major consequences for its capability as a global CO2 sink. New research published in Nature Geoscience now reveals a key player in shaping the resilience of the Amazon, and finds that regions with generally higher rainfall variability are more resilient to current and future climate disturbances. However, despite this 'training effect', the Amazon rainforest might not be able to keep up with the pace of ongoing climate change, the study shows.

PIK is the world's most influential climate think tank - Edenhofer, Schellnhuber, Rahmstorf are among most important German-speaking intellectuals

01/02/2019 - The Potsdam Institute for Climate Impact Research (PIK) is the world's most influential environmental policy think tank, as the "Global Go To Think Tank Index Report 2018" just published by the University of Pennsylvania shows. On top of this, three PIK scientists are among the "most important German-speaking intellectuals" according to the new Cicero ranking: Ottmar Edenhofer, Director of PIK, Hans Joachim Schellnhuber, Director Emeritus, and Stefan Rahmstorf, Chair of PIK's research department "Earth System Analysis".

Marlene Kretschmer wins Köppen-Preis for her outstanding dissertation on polar vortex

24.01.2019 - Marlene Kretschmer from the Potsdam Institute for Climate Impact Research (PIK), has been awarded the 2018 Wladimir Peter Köppen Prize for her remarkable dissertation completed at PIK and the University of Potsdam. Its “importance for climate research, in terms of its innovativeness and relevance, is outstanding”, the jury of the Hamburg-based Cluster of Excellence CliSAP praised the work.

Global warming didn’t pause - researchers disentangle “hiatus” confusion

19.12.2018 - The reality of ongoing climate warming might seem plainly obvious today, after the four warmest years on record and a summer of weather extremes in the whole northern hemisphere. A few years back however, some media and some experts were entangled in debates about an alleged pause in global warming – even though there never has been statistical evidence of any “hiatus”, as new research now confirms. In two recent studies, a group of international scientists joined forces to thoroughly disentangle any possible “hiatus” confusion, affirming that there was no evidence for a significant pause or even slowdown of global warming in the first place.

Record-wet and record-dry months increased in regions worldwide: climate change drives rainfall extremes

12.12.2018 - More and more rainfall extremes are observed in regions around the globe – triggering both wet and dry records, a new study shows. Yet there are big differences between regions: The central and Eastern US, northern Europe and northern Asia have experienced heavy rainfall events that have led to severe floods in recent past. In contrast, most African regions have seen an increased frequency of months with a lack of rain. The study is the first to systematically analyze and quantify changes in record-breaking monthly rainfall events from all over the globe, based on data from roughly 50,000 weather stations worldwide. Climate change from fossil fuel greenhouse gases has long been expected to disturb rainfall patterns.

Ricarda Winkelmann wins academics' young scientist award

06/12/2018 - Ricarda Winkelmann from the Potsdam Institute for Climate Impact Research (PIK) has been honoured as this year's Young Scientist of the Year by 'academics' by ZEIT publishing group. Winkelmann was awarded due to her outstanding and groundbreaking research and publication achievements in researching the climate system and the risks of climate change. She is junior professor for Climate System Analysis at the University of Potsdam and scientist at PIK in research domain Earth System Analysis. She heads the Leibniz project "DominoES - Domino Effects in the Earth System" as well as the PIK working group on ice sheet dynamics.

Ten PIK researchers among the most influential scientists in the world

29/11/2018 - Ten scientists, coming from different research domains from the Potsdam Institute for Climate Impact Research (PIK) are among the most highly cited researchers worldwide, according to a new ranking just published. Therewith, they are among the most influential scientifists in the world, their studies among the top 1% of scientific literature. Whether natural sciences or social sciences, PIK is one of the most renowned research institutions in Germany and worldwide, as the now published ranking once again shows.

Successful classic updated: "Climate Change" by Schellnhuber and Rahmstorf

23/11/2018 - Summer drought in Germany, heavy rainfalls in Japan, devastating forest fires in California, storms over the Mediterranean Sea - everyone is talking about climate change, not least after the devastating weather extremes this summer. In their book, Hans Joachim Schellnhuber and Stefan Rahmstorf summarise the current state of climate science in a compact and easy-to-understand way. "Climate change - diagnosis, prognosis, therapy", the German classic on climate change from the publishing house Beck, has now been completely updated for its 8th edition.

Winter weather extremes in the US and Europe: messing with giant airstreams in the stratosphere

22/11/2018 - Over Thanksgiving, arctic air masses are predicted to bring record-cold temperatures and frigid winds to the Northeast of the United States. Driver for such winter weather extremes is often the stratospheric polar vortex, a band of fast moving winds 30 kilometers above the ground. In winter, when the polar vortex is disturbed by upward-blowing air masses, this can bring cold spells over Northeastern America or Eurasia, a new study now shows. And paradox as it might seem, climate change might further disrupt the complex dynamics in the atmosphere – bringing us not only more hot extremes in summer but potentially also cold spells in winter.

Statement on the current California forest fires

12.11.2018 - The California forest fires are currently burning across the State having forced hundreds of thousands of residents to flee their homes, among them also stars like Miley Cyrus, Gerard Butler, Kim Kardashian or Lady Gaga. These are probably the worst forest fires in California's history.

Earth League meets up in New Delhi: Climate Jamboree and Science Circle

08.11.2018 - From weather extremes to sea-level rise and tipping elements - more than 10.000 youths came together with science experts and artists last week in New Delhi for the Climate Jamboree Conference. Johan Rockström, PIK Director Designate, and Stefan Rahmstorf, Chair of PIK research domain Earth System Analysis, were among the key speakers, with lectures on a safe future for humanity on earth and new insights and hot topics from climate science. Organized by Leena Srivastava of TERI School of Advanced Studies, the participative Climate Jamboree with scientific talks, workshops and concerts was the grand finale of a series of events with the aim to empower youth to engage for climate action and sustainable development.

Extreme weather will likely become more frequent due to stalling of giant waves in the atmosphere

01/11/2018 - Computer simulations predict a strong increase of events in which the undulations of the jet stream in the atmosphere stop moving along and grow very large. This can favor more frequent extreme weather events on the ground: the westerly winds stop pushing forward weather systems which hence become more persistent – a few sunny days grow into heatwaves, extended rains lead to floods. An international team of scientists links this to human-caused warming specifically in the Arctic.

Manifesto by Wolfgang Lucht: "Das Wasser der Nachfolge"

05.10.2018 - We live in the Anthropocene, an era in which mankind as a global, geological force is changing the earth. Climate change, ocean acidification, extinction of species, deforestation and overfishing are just a few symptoms of human influence on our planet. "So what is the churches' opinion on the environmental question?" What do we say as Christians?", asks Wolfgang Lucht, Co-Chair of the Research Domain Earth System Analysis at the Potsdam Institute for Climate Impact Research (PIK) in his manifesto "Das Wasser der Nachfolge". This chapter was published in the recently released German book "Life in the Anthropocene - Christian perspectives for a culture of sustainability" by oekom. His manifesto directly adresses the churches, whose commitment is vital for the necessary transformation to a socially and environmentally sustainable society.

Planet at risk of heading towards irreversible “Hothouse Earth” state

06/08/2018 - Keeping global warming to within 1.5-2°C may be more difficult than previously assessed. An international team of scientists has published a study in Proceedings of the National Academy of Sciences (PNAS) showing that even if the carbon emission reductions called for in the Paris Agreement are met, there is a risk of the planet entering what the scientists call “Hothouse Earth” conditions. A “Hothouse Earth” climate will in the long term stabilize at a global average of 4-5°C higher than pre-industrial temperatures with sea level 10-60 m higher than today, the paper says. The authors conclude it is now urgent to greatly accelerate the transition towards an emission-free world economy.

Hurricane Florence threatening the US coast

13/09/2018 - Hurricane Florence is threatening the US coast as it will likely hit North or South Carolina. Last year already brought unusually devastating tropical cyclones.

Europe’s renewable energy regulation could harm global forests

12/09/2018 - To fulfill the Paris Climate Agreement, which is backed by science, the European Union laudably plans to strongly enhance its renewable energy ambition – but a provision regulating the use of biomass for energy raises great concern among scientists. The new regulation would allow countries, power plants and factories to cut down trees and burn them for power or heat generation and to claim that this fully qualifies as low-carbon renewable energy. Currently Europe has mainly made use of biomass from wood waste and residues for bioenergy generation. But use could now ramp up to levels requiring massive input of stem wood as well, and this would be allowed under the new regulation. In stark contrast to the intentions of the EU, this would in fact also increase European greenhouse gas emissions and accelerate climate change, a team of scientists now argues in a comment published in Nature Communications.

Nice sunny days can grow into heat waves – and wildfires: summer weather is stalling

20/08/2018 - Be it heavy downpours or super-hot spells, summer weather becomes more persistent in North America, Europe and parts of Asia. When those conditions stall for several days or weeks, they can turn into extremes: heatwaves resulting in droughts, health risks and wildfires; or relentless rainfall resulting in floods. A team of scientists now presents the first comprehensive review of research on summer weather stalling focusing on the influence of the disproportionally strong warming of the Arctic as caused by greenhouse-gas emissions from burning fossil fuels. Evidence is mounting, they show, that we likely meddle with circulation patterns high up in the sky. These are affecting, in turn, regional and local weather patterns – with sometimes disastrous effects on the ground. This has been the case with the 2016 wildfire in Canada, another team of scientists show in a second study.

Summer of extremes - PIK experts in the media

07/26/2018 - Everybody seems to be talking about the weather these days, with extreme heat in Germany and Europe, forest fires in Sweden, Greece and California. From Japan to the Arctic - the Northern hemisphere is currently experiencing a heat wave and experts from the Potsdam Institute for Climate Impacts Research (PIK) were interviewed by numerous media outlets for an assessment of the current situation in the light of climate change.

What saved the West Antarctic Ice Sheet 10,000 years ago will not save it today

06/14/2018 - The retreat of the West Antarctic ice masses after the last Ice Age was reversed surprisingly about 10,000 years ago, scientists found. This is in stark contrast to previous assumptions. In fact, it was the shrinking itself that stopped the shrinking: relieved from the weight of the ice, the Earth crust lifted and triggered the re-advance of the ice sheet. However, this mechanism is much too slow to prevent dangerous sea-level rise caused by West Antarctica’s ice-loss in the present and near future. Only rapid greenhouse-gas emission reductions can.