Host of Climate Chat | Plain climate science & DATAVIZ | Mission: To Understand and Protect the Home Planet

On a rapidly changing planet
This might be the year everything changes, as those who don't count joules and radiative fluxes are too starting to feel the heat from reducing air-pollution. Many great scientists have tried to inform on this in the past decades (e.g. James Hansen, James Lovelock, Paul Crutzen and Veerabhadran Ramanathan). Policy makers and media have paid very little attention so far. This was the reason for me to start using my largely dormant Twitter account 3.5 years ago. To create awareness about rapid warming from rapidly reducing air pollution. There's mainly been a small crowd of 'climate doomers' and slightly anoyed climate scientists to interact with. In the past months this changed, as the additional accumulating heat is starting to surface. My amount of followers has tripled, the graphs we make receive millions of views and media around the world are paying attention. This is bigger than any one of us. We need specialized scientists to assess what this means for changes to monsoon systems, others that look at how ocean and atmospheric currents (might) change and how that could impact melting ice and sea level rise. We need politicians, legal experts and social scientists to learn what is at stake and debate the effects of unintentional and intentional emissions on climate, not just health and the environment. There are no easy choices in this. How much warming will the world except? And how fast can the rate of warming be until we are unable to adapt? When will we learn how high our dikes really need to be? How extreme will droughts get? How many people will lose their homes and need to move to greener pastures? Be it a locally overflowing refugee camp or to another country? Will we have the stability of global governance to face these accumulating challenges? Uncertainties are very large, which might be the main problem. We don't know how bad it will get, and anyone who tells you one way or another is lying. The precautionary principle tells us we have the duty to act. For ourselves, for our children and for strangers we will never meet. We are the most adaptable species known to ever have existed. I believe that with a more thorough understanding of our planet, humanity could become a beneficial force to life on Earth. If we soon aquire collective will to do so.
It cannot be re-stated enough that @LeonSimons8 has been the primary scientific voice pushing the narrative about the impacts of reduced sulfate aerosols on ocean temperatures. I'm grateful to see his tireless efforts finally being discussed by scientists and global media.
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Leon Simons 🌍 retweeted
Wow, just wow. The 2026 Pacific hurricane season east of the IDL is now ranked #2 & not far from surpassing 1992. Now I want to be clear that this does not mean we will surpass 300 ACE points, but the fact is that we might pass 1992 in ACE points at this rate on a given day due to 3 hurricanes churning at the same time, with 2 of them now being major. With Nolo forecasted to become a major in a few days, it would not shock me if we get to 300 ACE in the next week or two. Fun fact: We have been accumulating around 10-15 ACE points per day since September 21st. Running the calculations shows that we should reach 300 ACE in about 8-12 days (October 2-6) and break the all-time record by October 10th due to a 90% AOI in the EPAC that looks to become a hurricane in the next 5-8 days.
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The combination of sea level rise, a super El Niño and a storm surge will hit Baja California hard.
Well, this isn't great. Hurricane Polo will likely cross Baja California early next week before its remnants push into the U.S. Southwest. Potential for a higher-end flood threat — people in Arizona and New Mexico should watch closely.
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This is so bad.. Down is up and up is down.
Words practically meaning the opposite in physical jargon and everyday language shouldn't be conflated..
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Leon Simons 🌍 retweeted
The graph shows forcing. Which is mainly CO₂ and methane during the negative period (what we in Europe call the Weichselian glaciation). This is the imbalance:
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Leon Simons 🌍 retweeted
If you wish to use your eyes to read the study this graph is based on, you'll find it here: academic.oup.com/oocc/articl…
"The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command." George Orwell, 1984.
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"The Party told you to reject the evidence of your eyes and ears. It was their final, most essential command." George Orwell, 1984.
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Leon Simons 🌍 retweeted
It's the rate of change that poses such a threat
Crucial new research shows that the long term natural decline of global CO₂ from 3 to 1 million years ago was 'only' 20 ppm and that methane concentrations didn't change much. Another crucial new study shows that over the same period the whole global oceans cooled by about 2°C, while parts of the Northern Hemisphere (notably Greenland and the Arctic) started to freeze over. The past ~200 years humanity increased the global greenhouse gas forcing about 9,000,000% faster than the natural decline that took about 2 million years. And now the rate of greenhouse gas forcing (that what forces the climate to change) increase has accelerated to 20,000,000% of the natural decline rate (~+0.45 W/m²/dec vs ~-0.45 W/m²/2M yrs). We will talk about this and more tomorrow on Climate Chat. Join us on YouTube. Links below. Subscribe and hit the bell button on YouTube to get a notification when we go live.
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Here we go.. More rapid 🌀 intensification. "In the eastern North Pacific south of Mexico, Hurricane Polo has rapidly intensified from a tropical depression to a major hurricane in just over a day and continues to barrel toward category 5 strength." Dr Kim Wood
"This can't be" "This can't be true" "Acapulco has been destroyed"
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They get little attention compared to other greenhouse gases, but halogen compounds now in the atmosphere cause a global greenhouse gas forcing of >0.4 W/m²! The same order of magnitude as the gradual GHG decrease over millions of years that coincided with global glaciation!
The more you know ... The potent greenhouse gas SF₆ (atmospheric sulfur hexafluoride) currently contributes about 1.05 ppm to the level of CO2-equivalent in the atmosphere, now at 548 ppm. gml.noaa.gov/ccgg/trends_sf6…
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The rate at which humanity is changing the planet is mind boggling. On past, natural greenhouse gas changes:
Until very recently we only had ice core data on CO₂ and methane concentrations for the past 800,000 years. Ground breaking work by scientists now provides us with insight into the atmosphere of 3 million yrs ago! We talked about this on Climate Chat: piped.video/live/4HIB2rLyYvo
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It's the rate of change that poses such a threat
Crucial new research shows that the long term natural decline of global CO₂ from 3 to 1 million years ago was 'only' 20 ppm and that methane concentrations didn't change much. Another crucial new study shows that over the same period the whole global oceans cooled by about 2°C, while parts of the Northern Hemisphere (notably Greenland and the Arctic) started to freeze over. The past ~200 years humanity increased the global greenhouse gas forcing about 9,000,000% faster than the natural decline that took about 2 million years. And now the rate of greenhouse gas forcing (that what forces the climate to change) increase has accelerated to 20,000,000% of the natural decline rate (~+0.45 W/m²/dec vs ~-0.45 W/m²/2M yrs). We will talk about this and more tomorrow on Climate Chat. Join us on YouTube. Links below. Subscribe and hit the bell button on YouTube to get a notification when we go live.
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Leon Simons 🌍 retweeted
Definitely time to start testing .“So once this El Niño passes… the ocean ecosystem… may stay in a new state.” Plus, the next series of challenges will be even worse. Tempus fugit.
Scientists call for ‘emergency’ measures to save sea life from El Niño newscientist.com/article/258…
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What the f*ck! "Aramco [...], is responsible for more of the carbon emissions driving the escalating climate crisis than any other company in history" Thank you @dpcarrington, @EoghanGilmartin, @SilviaLazzaris, Rita Cruz, @simonguichard, @Simon__Guichard and David Haas!
Replying to @LeonSimons8
Apparently aerosols were deliberately left out, because "INDIA called for deleting it"?! And adding the invaluable figure WG1 SPM.2 was "opposed by SAUDI ARABIA and INDIA" in a f*cking huddle?! What's next? Removing gravity from physics education?
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I can't say I'm very surprised..
COP30 President: "We want to ensure transparency, inclusivity, predictability and legitimacy. Does everyone agree with this approach?" Saudi Arabia: "Hell no, we need you to confirm that our backroom huddle meetings remain, so we can halt progress without anyone noticing"
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Conflicts of interest and censorship are an inherent part of the IPCC process. And the summary for policymakers (where few read beyond) are much worse even than the full reports.
Censorship is an inherent part of the IPCC process. "INDIA called for deleting it" And adding the invaluable figure WG1 SPM.2 was "opposed by SAUDI ARABIA and INDIA" I recommend reading the actual minutes yourself
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"In the central estimates, cumulative climate-related deaths over 1900–2300 are roughly 5.8 billion under business-as-usual, compared with around 1.6–2.1 billion under net-zero pathways" 1/2
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'Climate Change: A Precautionary Empirical Framework for Climate-Related Mortality' New preprint paper by Nigel Howard & Peter Newman eartharxiv.org/repository/vi…
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Climate Chat is now live!
Replying to @HyperHydr0
See the time for your region in the link below and subscribe and hit the bell button to get a notification when we go live. piped.video/live/-GyXpRsOVuc
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Leon Simons 🌍 retweeted
Breaking News! Code FUBAR!!! Yesterday's Nino 3.4 sea-surface temperature anomaly (preliminary) was a record 3.047°C above the 1991-2020 baseline, beating the previous record of 3.034°C set on November 19, 2015. It will take about 2 weeks to verify. Stay tuned!
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Leon Simons 🌍 retweeted
Extreme weather during summer 2026 is estimated to have cost the EU 180 billion Euros But still governments refuse to acknowledge the scale of the threat and turn away from any serious, effective, action Hard to comprehend really theguardian.com/environment/…
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