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Joeri Rogelj

@joerirogelj.bsky.social
5.9K followers 516 following 185 posts

prof. climate science & policy | Imperial College London | 1.5C/net zero/carbon budget/pathways/justice | IPCC & UNEP lead author | ESABCC member | father

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Reposted by Joeri Rogelj
IIASA @iiasa.ac.at · 22/09/2026
⚖️ New IIASA-led research shows that integrating fairness into climate models can change how the global mitigation effort is shared across regions while still achieving the same climate goal. The findings offer new insights for translating global ambition into action. 👉 iiasa.ac.at/news/sep-202...
iiasa.ac.at
Fairness informs how the world cuts emissions
Who cuts emissions fastest, and who supports others do so, are central questions in global climate action. New IIASA-led research shows that building fairness into climate models from the start can in...
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Reposted by Joeri Rogelj
IIASA @iiasa.ac.at · 22/09/2026
Authors: @setupelz.bsky.social, Oliver Fricko, Keywan Riahi, @shonali-p.bsky.social, Elina Brutschin, @joerirogelj.bsky.social, Volker Krey, Dr Injy Johnstone, Adriano Vinca, @carlschleussner.bsky.social, @kikstra.bsky.social and @gidden.bsky.social @ioppublishing.bsky.social
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Reposted by Joeri Rogelj
Centre for Environmental Policy, Imperial @ic-cep.bsky.social · 18/09/2026
🌍 Global temperatures are likely to cross the 1.5°C threshold within years, according to a landmark @unep.org report co-authored by Professor @joerirogelj.bsky.social. The report calls for urgent action to minimise the scale and duration of 1.5°C overshoot.
imperial.ac.uk
Dangerous overshoot of 1.5°C warming threshold must be limited, Imperial scientist warns in UN report
Global temperatures are set to cross 1.5°C above pre-industrial levels within years, leading to an escalation of climate impacts, the UN Environm...
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Joeri Rogelj @joerirogelj.bsky.social · 02/09/2026
A new UN report starts the societal conversation on the implications of a new reality: a world in which 1.5°C of global warming will soon be reached. 👇
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Reposted by Joeri Rogelj
Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 02/09/2026
Global temperatures are set to cross 1.5°C above pre-industrial levels within years, leading to an escalation of climate impacts, warns @unep.org in a landmark report co-authored by @imperialcollegeldn.bsky.social 's @joerirogelj.bsky.social Read in full 👉 buff.ly/ZKLfRau
Headshot off Joeri Rogelj against backdrop of the climate stripes, with a quote from Prof Joeri Rogelj: Overshooting 1.5°C is a painful reminder that failing to cut greenhouse gas emissions has consequences we can now no longer avoid, only limit,” says Professor Rogelj. “Our response requires mitigation and adaptation to move together: near-term emissions reductions limit overshoot and reduce harm, but weak mitigation will push communities and ecosystems beyond their ability to adapt"
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Joeri Rogelj @joerirogelj.bsky.social · 02/09/2026
New UN Report @unep.org World set to cross 1.5°C global warming, but options to limit, adapt to and return from higher temperatures exist. The report covers implications of temperature overshoot of 1.5°C, for our responses, adapt and manage this new normal. Some key messages /1
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Joeri Rogelj @joerirogelj.bsky.social · 10/07/2026
"On a hotter planet, there will be more heatwaves, and they will become more intense" It's remarkable how straightforward a message can at times still be informative.
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Reposted by Joeri Rogelj
Centre for Environmental Policy, Imperial @ic-cep.bsky.social · 10/07/2026
The drying of France’s Loire River and intensifying European heatwaves are stark reminders of a warming world. As Professor @joerirogelj.bsky.social explains: “On a hotter planet, there will be more heatwaves, and they will become more intense.”
dailymail.com
France's heatwave 'desert': River is reduced to sandbank
As Europe experienced its most severe ever recorded heatwave in June, drought conditions worsen in France as images show a completely barren Loire River in Montjean-sur-Loire.
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Reposted by Joeri Rogelj
Centre for Environmental Policy, Imperial @ic-cep.bsky.social · 12/06/2026
Professor @joerirogelj.bsky.social and Dr @robinlamboll.bsky.social have contributed to the latest Indicators of Global Climate Change (IGCC) assessment, showing human-induced warming reached 1.37°C in 2025. At current emissions trends, 1.5°C could be exceeded within around four years.
imperial.ac.uk
Earth's climate continues to warm as heat accumulation reaches record levels
Researchers from Imperial College London have contributed to a major international climate assessment showing that the Earth is accumulating heat at...
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Reposted by Joeri Rogelj
Carl Schleussner @carlschleussner.bsky.social · 21/05/2026
This is an important one! If you wonder what's wrong here, see for example a paper from @joerirogelj.bsky.social and myself a while back: iopscience.iop.org/article/10.1... or also from @meinshausen.bsky.social and Zeb Nicholls: iopscience.iop.org/article/10.1...
iopscience.iop.org
Unintentional unfairness when applying new greenhouse gas emissions metrics at country level
Unintentional unfairness when applying new greenhouse gas emissions metrics at country level, Rogelj, Joeri, Schleussner, Carl-Friedrich
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Reposted by Joeri Rogelj
Centre for Environmental Policy, Imperial @ic-cep.bsky.social · 09/04/2026
🌍 Cutting carbon emissions isn’t enough – we also need carbon removal. But planting trees or energy crops at scale can clash with biodiversity. Careful planning is key, says Professor @joerirogelj.bsky.social and colleagues. 🌱 #ClimateAction #Biodiversity #CarbonRemoval #Sustainability
theconversation.com
Planting trees to remove carbon can harm the environment – or protect it: study highlights trade-offs
Carbon removal strategies may conflict with biodiversity conservation, but careful choices could bring benefits.
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Reposted by Joeri Rogelj
Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 13/04/2026
In @theconversation.com @rubenpruetz.bsky.social, @joerirogelj.bsky.social, Sabine Fuss and Gaurav Ganti write that carbon removal strategies may conflict with biodiversity conservation in many instances: for example, planting trees and energy crops in pristine ecosystems such as savannas.
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Reposted by Joeri Rogelj
Kate Marvel @drkatemarvel.bsky.social · 24/03/2026
I just resigned from NASA. It breaks my heart to leave, but I’ve become convinced the best path forward is to do the best science I can, and that can’t be here anymore. I’m still in love with the promise of those four magic letters. Ad astra per aspera, and remember: Earth is the only good planet.
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Joeri Rogelj @joerirogelj.bsky.social · 20/03/2026
POSTDOC OPPORTUNITY 🌍 Are you an early-career researcher interested in working at the interface of climate science, law, and policy? A new opportunity at @granthamicl.bsky.social at @imperialcollegeldn.bsky.social 👇
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Joeri Rogelj @joerirogelj.bsky.social · 17/03/2026
Another great job opportunity for an early career researcher to join us as a chapter scientist on our journey to pull together the best possible chapter on sustainable low-carbon futures for the @ipcc.bsky.social 7th assessment report! Details below 👇
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Reposted by Joeri Rogelj
Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 11/03/2026
The EU’s agri-food system must prepare for rising climate risks and accelerate emission reductions, according to the @esabcc.bsky.social. A new report, co-authored by Imperial's Prof @joerirogelj.bsky.social, highlights rising climate risks to Europe's food system about provides 6 recommendations 🧵
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Joeri Rogelj @joerirogelj.bsky.social · 10/03/2026
Are you a young academic working on climate and feel ready for a move? We are recruiting two Assistant/Associate Professors @granthamicl.bsky.social at Imperial College London @imperialcollegeldn.bsky.social (1/6)
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Reposted by Joeri Rogelj
European Scientific Advisory Board on Climate Change @esabcc.bsky.social · 11/12/2025
Today, @joerirogelj.bsky.social, member of @esabcc.bsky.social, spoke at the @europarl.europa.eu's conference ‘From Promise to Action – 10 Years of the Paris Agreement’. He highlighted the role of science in climate policymaking, the impact of disinformation, and the outlook for the future.
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Reposted by Joeri Rogelj
Peter Thorne @peterthorne.bsky.social · 28/01/2026
New discussion paper just dropped that’s taken shall we say a little work to get this far … essd.copernicus.org/preprints/es... please be kind. Not on an at all sensitive topic in the slightest.
essd.copernicus.org
How well can we quantify when 1.5 °C of global warming has been exceeded?
Abstract. Parties to the 2015 Paris Agreement agreed to limit the long-term increase in global average temperature to well below 2 °C and pursue efforts to keep temperatures below 1.5 °C relative to p...
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Reposted by Joeri Rogelj
Bill Hare @billhare.bsky.social · 30/01/2026
A commentary in @nature.com argues the 1.5°C temperature limit has “outlived its usefulness” because we’re headed towards overshoot and should be replaced by a “clean-energy shift” metric. That’s the wrong diagnosis. Here is why. www.nature.com/articles/d41...
nature.com
As we breach 1.5 °C, we must replace temperature limits with clean-energy targets
Actionable goals are needed to guide the world towards what needs to happen most quickly: shifting economies to clean energy sources.
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Reposted by Joeri Rogelj
ESM2025 @esm2025.bsky.social · 30/11/2025
Today, ESM2025 officially comes to an end! Since 2021, our European consortium has been building a new generation of Earth System Models to support mitigation & adaptation strategies aligned with the Paris Agreement. Watch these clips of our final video to see how far we've come! 🧵👇 #ESM2025isOver
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Reposted by Joeri Rogelj
Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 24/11/2025
Professor @joerirogelj.bsky.social said: "COP30 leaves us between a rock and a hard place […] These NDCs have come in hesitantly, inadequately and unambitiously. They move the needle, but insufficiently to confidently avoid 1.5°C or even 2°C of global warming.”
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Joeri Rogelj @joerirogelj.bsky.social · 22/11/2025
New text @cop30brazil.bsky.social provides a glimpse of where #COP30 might land. Some reflections on references to science and evidence. /1 unfccc.int/sites/defaul...
unfccc.int
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Reposted by Joeri Rogelj
Simon Evans @drsimevans.carbonbrief.org · 21/11/2025
COP30: "Best available science" = IPCC is back The second draft "mutirão" text "recognises the centrality of equity and the best available science…as provided by the IPCC"
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Reposted by Joeri Rogelj
Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 11/11/2025
⚠️Current pledges and policies to reduce greenhouse gas emissions put the world on a high-risk climate track, towards warming levels of 2.8°C by the end of this century warn @joerirogelj.bsky.social, @robinlamboll.bsky.social & @j-bird.bsky.social. 📒 ow.ly/cpTr50Xq1X1 #COP30
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Reposted by Joeri Rogelj
Centre for Environmental Policy, Imperial @ic-cep.bsky.social · 14/11/2025
In 2009, the Maldives’ underwater cabinet meeting showed the world the reality of rising seas. 🌊 As Professor @joerirogelj.bsky.social notes, it helped put the 1.5°C target “front and centre.” 16 years on, its message is more urgent than ever.
bbc.co.uk
'This is going to be much bigger than we thought': The legacy of a famous underwater photoshoot
The photo shaped the world's perception of the existential threat climate change poses to low-lying island nations.
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Reposted by Joeri Rogelj
Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 06/11/2025
COP30: Study reveals “highest possible ambition” for countries' climate pledges With COP30 kicking off on Monday, a new paper by Julia Schönfeld and Professor Joeri Rogelj provides a framework for assessing countries’ climate pledges 🧵 Learn more: ow.ly/CiB050XnMK2
ow.ly
COP30: Study reveals “highest possible ambition” for countries' climate pledges | Imperial News | Imperial College London
A new study, for the first time, shows how the ‘highest possible ambition’ of countries' climate pledges can be assessed.
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Joeri Rogelj @joerirogelj.bsky.social · 06/11/2025
Stories abound these days showing that global warming exceeding 1.5C is now part of science's best estimate. What does that mean for the #ParisAgreement 1.5C goal? A good time to revive a thread about a piece we wrote earlier this year on this topic in @science.org 👇🌍🌡️
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Joeri Rogelj @joerirogelj.bsky.social · 05/11/2025
Two years ago, the @esabcc.bsky.social published its advice on the EU's 2040 emissions reduction target. We indicated a 90-95% reduction relative 1990 levels. Today, EU climate ministers agreed on a 90% target, with an 66.25-72.5% reduction as part for its new NDC for 2035.
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Joeri Rogelj @joerirogelj.bsky.social · 04/11/2025
Today is the official launch of this year's @unep.org #EmissionsGap report. It's title says it all OFF TARGET that's true for progress, NDCs and implementation
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Joeri Rogelj @joerirogelj.bsky.social · 04/11/2025
What is the current state of climate action? What do latest country pledges add up to? And how much global warming are we in for? 🌍🌡️ 🔥 For the 16th year in a row, we publish the @unep.org #emissionsgap report. As usual, I looked the assessment of the global gap and its global warming implications.
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Reposted by Joeri Rogelj
Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 04/11/2025
Grantham Institute Director of Research Professor @joerirogelj.bsky.social was lead author on Chapter 4 of the report, which also includes contributions from Imperial’s Dr @robinlamboll.bsky.social. Read the report in full here: ow.ly/V7Zy50XmtCz
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Joeri Rogelj @joerirogelj.bsky.social · 13/10/2025
OUT NOW: we revisit the pivotal moment when science, institutions and politics aligned to deliver the UK’s #NetZero target. At a time of political divergence, the evidence for #ClimateAction remains clear. Evidence-based #ClimatePolicy is more relevant than ever. @granthamicl.bsky.social
youtube.com
Net Zero: The inside story of the UK’s climate target
YouTube video by Grantham Imperial
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Joeri Rogelj @joerirogelj.bsky.social · 13/10/2025
OUT NOW: we revisit the pivotal moment when science, institutions and politics aligned to deliver the UK’s #NetZero target. At a time of political divergence, the evidence for #ClimateAction remains clear. Evidence-based #ClimatePolicy is more relevant than ever. @granthamicl.bsky.social
youtube.com
Net Zero: The inside story of the UK’s climate target
YouTube video by Grantham Imperial
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Joeri Rogelj @joerirogelj.bsky.social · 09/10/2025
Next week, we reflect on how science and society shaped the UK’s #NetZero target. As political consensus wavers, the scientific evidence underpinning the need for rapid #ClimateAction remains robust and unequivocal. 1/2
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Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 09/10/2025
COMING SOON… In 2019, the UK made history as the first major economy to commit to net zero by 2050. But, while the science hasn’t changed, political consensus is fracturing. We can’t wait to share our new film & to tell the inside story of the UK’s climate target Stay tuned… 👀13 October
Joanna Haigh seen from behind the cameras, with two members of crew either side.Joeri Rogelj seen from behind the camera, sitting ready to interviewTheresa May ready to interview, seen from behind the camera and lighting equipment
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Joeri Rogelj @joerirogelj.bsky.social · 02/10/2025
Pope Leo XIV has reaffirmed the imperative to act upon climate change and environmental degradation. This firm response to climate science deniers marks the 10th anniversary of his Predecessor Pope Francis' encyclical "On Care of Our Common Home". www.bbc.com/news/article...
bbc.com
Pope Leo hits out at critics of global warming
In his first major statement on climate change, the pontiff criticises those who minimise climate change.
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IIASA @iiasa.ac.at · 02/10/2025
The third and final day of the #OvershootConference kicked off with an insightful report-back and reflection session, where theme leads shared insights from their discussions so far. See insights from discussions on Day 2 in the thread below:
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IOPP Environment and Energy @iopp-environment.bsky.social · 29/09/2025
🌍New #ERL focus collection on #climate #overshoot is open! Linked to @iiasa.ac.at Overshoots conference in Vienna this week. ERL Publisher Lauren Carter will be attending, email to discuss a contribution: Lauren.Carter@ioppublishing.org 📅Deadline: 30 April 2026 🔗 iopscience.iop.org/collections/...
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IIASA @iiasa.ac.at · 15/09/2025
@joerirogelj.bsky.social: “The pursuit of 1.5°C endures as a legal and ethical imperative. Overshoot does not erase this goal - it makes it more urgent.” He called overshoot a test of our generation’s responsibility. #ScienceInAction #ParisAgreement
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Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 11/09/2025
Despite the centrality of equity in the Paris Agreement, no framework exists to allocate responsibilities for carbon dioxide removals among countries. A new paper, co-authored by Imperial's Professor ​@joerirogelj.bsky.social​, presents a framework for allocating CDR globally 🧵
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Carbon Brief @carbonbrief.org · 08/09/2025
NEW – Guest post: How the role of carbon storage has been hugely overestimated | @gidden.bsky.social @joerirogelj.bsky.social Read here: buff.ly/QY7LyJ8
buff.ly
Guest post: How the role of carbon storage has been hugely overestimated - Carbon Brief
Removing carbon dioxide (CO2) from the atmosphere is widely expected to play a key role in meeting the goals of the Paris Agreement.
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Joeri Rogelj @joerirogelj.bsky.social · 04/09/2025
In a new study, we estimate how much geological CO2 storage capacity would be available when considering social, environmental, seismic and other risks. Lead author @gidden.bsky.social wrote an extensive 🧵on the work 👇
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Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 03/09/2025
Coauthor @joerirogelj.bsky.social Rogelj, Director of Research at the Grantham Institute says: “This study should be a gamechanger for carbon storage. It can no longer be considered an unlimited solution to bring our climate back to a safe level.
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Joeri Rogelj @joerirogelj.bsky.social · 03/09/2025
NEW STUDY: How much CO2 can we safely store in geological formations? In a new @nature.com study, we cross-check established academic and industry estimates with various risk factors. We find a prudent geological CO2 storage limit that is about 10x smaller. /1
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Joeri Rogelj @joerirogelj.bsky.social · 28/08/2025
Announcement: Climate Science and Policy Event on 9 September 2025 by @iiasa.ac.at at the @royalsociety.org Register if you're interested in attending in person. 👇
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Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 23/07/2025
⚖️Climate litigation is entering a new era 🌏 Thanks to attribution science, courts now have the tools to link climate impacts, such as floods, wildfires and extreme heat to major polluters — and assign legal responsibility. 🧵 📒 imperial.ac.uk/stories/polluters-on-trial
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Joeri Rogelj @joerirogelj.bsky.social · 14/07/2025
New research on limits to CO2 removal (CDR). CDR is key to our ambition to stop adding climate pollution to the atmosphere. Because it's uncertain how much will be delivered and it clearly comes with risks of social & environmental side-effects, legal issues arise. This paper provides an overview. 👇
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Grantham Institute - Climate Change and the Environment @granthamicl.bsky.social · 09/07/2025
⛈️ @frediotto.bsky.social reviewed extreme weather, such as the LA wildfires, to show that climate change is outpacing adaptation efforts. 🎯 @joerirogelj.bsky.social warns that passing the 1.5°C goal only intensifies the legal & ethical obligations of the Paris Agreement. buff.ly/dIdDn5a
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Joeri Rogelj @joerirogelj.bsky.social · 23/06/2025
What becomes of the 1.5°C goal now that global warming is approaching that level?🌍🔥🌡️ In a new @science.org Policy Forum we explain how the 1.5°C goal remains a critical legal & ethical benchmark, even as the world nears and may soon exceed 1.5°C of global warming🧵1/ www.science.org/doi/10.1126/...
science.org
The pursuit of 1.5°C endures as a legal and ethical imperative in a changing world
As the world nears 1.5°C of global warming, near-term emissions reductions and adequate adaptation become ever more important to ensure a safe and livable planet for present and future generations
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