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.

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 👇

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 👇

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 🧵

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)

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.

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.

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...

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

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.”

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...

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"

⚠️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

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.

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

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 👇🌍🌡️

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.

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

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.

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

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

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

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

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

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...

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:

🌍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: [email protected] 📅Deadline: 30 April 2026 🔗 iopscience.iop.org/collections/...

@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

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 🧵

NEW – Guest post: How the role of carbon storage has been hugely overestimated | @gidden.bsky.social @joerirogelj.bsky.social Read here: buff.ly/QY7LyJ8

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 👇

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.

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

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. 👇

⚖️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

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. 👇

⛈️ @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

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/...

From litigation to misinformation, and COP30 to populism, our panel discussion was a lively affair. Thank you to all of our panellists, everyone who attended the event, our co-hosts, the EU Delegation to the UK. #COP30 #CountdownToCOP30

Prof @joerirogelj.bsky.social warned that passing the 1.5°C goal only intensifies the legal & ethical obligations of the Paris Agreement. Every fraction of warming creates a more dangerous world. Achieving net-negative emissions & bring warming back below 1.5°C must be the long-term goal.

In case you missed it... The 🇪🇺 Scientific Advisory Board on Climate Change #ESABCC warns "against international carbon credits to meet the 2040 target, as they risk diverting resources from domestic investments and could undermine environmental integrity." News item 👇 | Link to full report below

The paper, published in Science by @joerirogelj.bsky.social‬ & Lavanya Rajamani, argues that determining precisely when the world crosses 1.5°C is not necessary, because the decisions needed in response are already clear and do not suddenly change at that point.

Incisive and brilliant, an absolute must-read from Professors @joerirogelj.bsky.social & Lavanya Rajamani!

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/...

This is really important because it shows the limits of adaptation. We cannot adapt to everything - we cannot adapt our way out of climate change. Nice coverage of recent paper by Hultgren et al in @nature.com on impacts on agriculture considering adaptation. www.carbonbrief.org/staple-crops...

Headlines on international media report on 3 (or 2) years left before we exhaust the 1.5C carbon budget. How did this year’s IGCC estimate of the remaining carbon budget end up with a 74% reduction compared to the latest @IPCC_CH report? A short deeper dive. /1

Is the UK hot right now? YES - it's hot! Live temperature updates hour by hour, every day. istheukhotrightnow.com

And of course there was a typo in the visual I posted earlier. Three thumbs up and green heart for whoever can spot the difference between the former and current version. 🔎👁️🤯

⚠️Global warming caused by humans is advancing at 0.27°C per decade – the highest rate since records began. This is one of the indicators updated every year by over 60 international scientists in the annual Indicators of Global Climate Change report – published today. doi.org/10.5194/essd... /1

🚨Excited to share my new paper published in ERL: "An exploration and evaluation framework for climate change mitigation scenarios with varying feasibility and desirability", co-authored with @shivmit.bsky.social @robinlamboll.bsky.social @joerirogelj.bsky.social tinyurl.com/yh3rspns (1/8)