James Hansen
@drjamesehansen.bsky.social
Director of Climate Science, Awareness and Solutions at Columbia University http://csas.earth.columbia.edu | Formerly Director of NASA GISS | jimehansen.substack.com
columbia.edu/~jeh1/
columbia.edu/~jeh1/
And then I misspelled Cal's nickname (The Big Dumper) and none of my young coauthors caught it -- are there no baseball fans among young people?
February 7, 2026 at 2:38 AM
And then I misspelled Cal's nickname (The Big Dumper) and none of my young coauthors caught it -- are there no baseball fans among young people?
The presumed upcoming El Nino will help cement and quantify global warming acceleration, showing that 2C global warming is likely to be reached in the 2030s, not at midcentury.
See Another El Nino Already? mailchi.mp/caa/another-... Also available on Substack: jimehansen.substack.com/p/another-el...
See Another El Nino Already? mailchi.mp/caa/another-... Also available on Substack: jimehansen.substack.com/p/another-el...
February 6, 2026 at 3:24 PM
The presumed upcoming El Nino will help cement and quantify global warming acceleration, showing that 2C global warming is likely to be reached in the 2030s, not at midcentury.
See Another El Nino Already? mailchi.mp/caa/another-... Also available on Substack: jimehansen.substack.com/p/another-el...
See Another El Nino Already? mailchi.mp/caa/another-... Also available on Substack: jimehansen.substack.com/p/another-el...
The chaos in government today has potential to seed huge gains a few years from now; more on that later. For now we must stem disastrous ideas.
See Fix Our Forests Fiasco – mailchi.mp/caa/fix-our-...
Also available on Substack: jimehansen.substack.com/p/fix-our-fo...
See Fix Our Forests Fiasco – mailchi.mp/caa/fix-our-...
Also available on Substack: jimehansen.substack.com/p/fix-our-fo...
January 30, 2026 at 3:02 PM
The chaos in government today has potential to seed huge gains a few years from now; more on that later. For now we must stem disastrous ideas.
See Fix Our Forests Fiasco – mailchi.mp/caa/fix-our-...
Also available on Substack: jimehansen.substack.com/p/fix-our-fo...
See Fix Our Forests Fiasco – mailchi.mp/caa/fix-our-...
Also available on Substack: jimehansen.substack.com/p/fix-our-fo...
It’s asking a lot to expect young people to understand the real climate story. I’m thrilled to learn that many of them may be open-minded mavericks. – mailchi.mp/caa/mavericks
Also available on Substack:
jimehansen.substack.com/p/mavericks
Also available on Substack:
jimehansen.substack.com/p/mavericks
January 22, 2026 at 2:53 PM
It’s asking a lot to expect young people to understand the real climate story. I’m thrilled to learn that many of them may be open-minded mavericks. – mailchi.mp/caa/mavericks
Also available on Substack:
jimehansen.substack.com/p/mavericks
Also available on Substack:
jimehansen.substack.com/p/mavericks
Three things, all at once, all the time, if you want better understanding and answers sooner – mailchi.mp/caa/three-th...
Also available on Substack: jimehansen.substack.com/p/three-thin...
Also available on Substack: jimehansen.substack.com/p/three-thin...
January 14, 2026 at 12:49 PM
Three things, all at once, all the time, if you want better understanding and answers sooner – mailchi.mp/caa/three-th...
Also available on Substack: jimehansen.substack.com/p/three-thin...
Also available on Substack: jimehansen.substack.com/p/three-thin...
Let’s see what we can learn from temperature change in the next two years – mailchi.mp/caa/global-t...
Also available on Substack: jimehansen.substack.com/.../global-t....
Also available on Substack: jimehansen.substack.com/.../global-t....
December 18, 2025 at 2:26 PM
Let’s see what we can learn from temperature change in the next two years – mailchi.mp/caa/global-t...
Also available on Substack: jimehansen.substack.com/.../global-t....
Also available on Substack: jimehansen.substack.com/.../global-t....
Warning! This colorful chart is censored by IPCC - mailchi.mp/caa/warning-...
Also available on Substack: jimehansen.substack.com/p/warning-th...
Also available on Substack: jimehansen.substack.com/p/warning-th...
November 21, 2025 at 3:33 PM
Warning! This colorful chart is censored by IPCC - mailchi.mp/caa/warning-...
Also available on Substack: jimehansen.substack.com/p/warning-th...
Also available on Substack: jimehansen.substack.com/p/warning-th...
This issue is the potential catastrophic consequences, if we let the ice shelves melt to the point that the West Antarctic ice sheet collapses -- increased snowfall is negligible by comparison.
November 12, 2025 at 3:24 PM
This issue is the potential catastrophic consequences, if we let the ice shelves melt to the point that the West Antarctic ice sheet collapses -- increased snowfall is negligible by comparison.
The ocean warming is causing ice shelves to melt, but, as you know from the ice cubes in your drink, melting of ice in the ocean has no effect on sea level. Small ongoing sea level changes, whichever direction, have modest impact.
November 12, 2025 at 3:23 PM
The ocean warming is causing ice shelves to melt, but, as you know from the ice cubes in your drink, melting of ice in the ocean has no effect on sea level. Small ongoing sea level changes, whichever direction, have modest impact.
I have not had time to look at data, but such a result is possible temporarily. Accelerated global warming is causing increased snowfall over ice sheets, especially Antarctica -- and this shows up as at least intermittent ice sheet mass gain in gravity satellite data.
November 12, 2025 at 3:23 PM
I have not had time to look at data, but such a result is possible temporarily. Accelerated global warming is causing increased snowfall over ice sheets, especially Antarctica -- and this shows up as at least intermittent ice sheet mass gain in gravity satellite data.
I have been notified that the video link to my Helsinki talk does not work for some people. Here's an alternative link for those who prefer a YouTube version: youtu.be/D2abyXGvELI
James Hansen - Climate Reckoning in ATLAS25, Operaatio Arktis, Helsinki, Finland
YouTube video by Climate Science, Awareness and Solutions
youtu.be
November 10, 2025 at 3:18 PM
I have been notified that the video link to my Helsinki talk does not work for some people. Here's an alternative link for those who prefer a YouTube version: youtu.be/D2abyXGvELI
Climate talk in Helsinki at request of young people standing up for their future - mailchi.mp/caa/a-climat...
Also available on Substack: jimehansen.substack.com/p/a-climate-...
Video: drive.google.com/file/d/1NGOp...
Also available on Substack: jimehansen.substack.com/p/a-climate-...
Video: drive.google.com/file/d/1NGOp...
November 7, 2025 at 3:03 PM
Climate talk in Helsinki at request of young people standing up for their future - mailchi.mp/caa/a-climat...
Also available on Substack: jimehansen.substack.com/p/a-climate-...
Video: drive.google.com/file/d/1NGOp...
Also available on Substack: jimehansen.substack.com/p/a-climate-...
Video: drive.google.com/file/d/1NGOp...
Predictably, soon, most young people will reject extremist views. Nature’s Corridor (draft Chapter 1 of Sophie’s Planet) could help heal wounds of the past. mailchi.mp/caa/natures-...
Also available on Substack: jimehansen.substack.com/p/natures-co...
Also available on Substack: jimehansen.substack.com/p/natures-co...
September 16, 2025 at 12:50 PM
Predictably, soon, most young people will reject extremist views. Nature’s Corridor (draft Chapter 1 of Sophie’s Planet) could help heal wounds of the past. mailchi.mp/caa/natures-...
Also available on Substack: jimehansen.substack.com/p/natures-co...
Also available on Substack: jimehansen.substack.com/p/natures-co...
Draft Chapter 10 of Sophie’s Planet, Venus Syndrome & Runaway Climate (mailchi.mp/caa/chapter-...) is an introduction (also available on Substack: jimehansen.substack.com/p/chapter-10...). Quantitative analysis with insights on climate physics will follow.
Chapter 10. The Venus Syndrome & Runaway Climate
James Hansen
jimehansen.substack.com
August 28, 2025 at 11:35 AM
Draft Chapter 10 of Sophie’s Planet, Venus Syndrome & Runaway Climate (mailchi.mp/caa/chapter-...) is an introduction (also available on Substack: jimehansen.substack.com/p/chapter-10...). Quantitative analysis with insights on climate physics will follow.
We, and young people, need help from people who understand the essence of climate science. See Forest versus Trees - columbia.edu/~jeh1/mailin... or its abbreviation - mailchi.mp/caa/seeing-t... also available on my Substack - jimehansen.substack.com/p/seeing-the...
August 6, 2025 at 12:04 PM
We, and young people, need help from people who understand the essence of climate science. See Forest versus Trees - columbia.edu/~jeh1/mailin... or its abbreviation - mailchi.mp/caa/seeing-t... also available on my Substack - jimehansen.substack.com/p/seeing-the...
Draft Preface for Sophie’s Planet. Criticisms welcome. See 17 July - Sophie’s Planet - mailchi.mp/caa/sophies-...
July 18, 2025 at 12:23 PM
Draft Preface for Sophie’s Planet. Criticisms welcome. See 17 July - Sophie’s Planet - mailchi.mp/caa/sophies-...
The GISS Formula for scientific research cannot be exterminated. See 8 July - A Formula to Keep the Science Flame Burning - mailchi.mp/caa/a-formul...
July 8, 2025 at 12:39 PM
The GISS Formula for scientific research cannot be exterminated. See 8 July - A Formula to Keep the Science Flame Burning - mailchi.mp/caa/a-formul...
There is time for a thoughtful view of our fellow creatures and habitat. See 22 May - End of an Era - mailchi.mp/caa/end-of-a...
May 22, 2025 at 2:50 PM
There is time for a thoughtful view of our fellow creatures and habitat. See 22 May - End of an Era - mailchi.mp/caa/end-of-a...