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William F. Lamb

@wflamb.bsky.social
7.4K followers 2.6K following 120 posts

Climate policy researcher at the Potsdam Institute for Climate Impact Research. I work on emissions trends, policy evaluation, carbon dioxide removal and climate obstruction. Scot in Deutschland. lambwf.github.io

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Reposted by William F. Lamb
Glen Peters @glenpeters.bsky.social · 21/09/2026
Many countries now report GHG emissions to the UNFCCC. There is a wealth of data, and many stories to tell. Check out the processed data here, via @wflamb.bsky.social lambwf.github.io/Tidy-GHG-Inv...
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David Ho @davidho.bsky.social · 22/08/2026
I hope 2025 & 2026 have adequately prepared everyone for the shitshow that will be 2027: Strongest El Niño and highest global temperature on record Energy and affordability crisis from the illegal war End of 3-year federal science grants awarded in 2024 AI bubble bursting Continued rise of fascism
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Prof Julia Steinberger 🌹🌱🌍 #ClimateAction #Fightfascism @jksteinberger.bsky.social · 29/06/2026
🚨🥵🚨 💀 🚨 EXTREME CLIMATE HEAT ALERT. Paris is heatwave is back to 40C by next Tuesday. These are deadly conditions, especially for the poor and vulnerable, all over Europe. And this will only get worse, due to fossil fuel corruption of our governments and media. 1/7
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William F. Lamb @wflamb.bsky.social · 29/06/2026
This weekend I learned that even with: - good insulation - window shutters - triple glazing on half our windows (double on the rest) - maximum night-time ventilation ...there is no way to keep our flat naturally cool over such an extended heatwave
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William F. Lamb @wflamb.bsky.social · 27/04/2026
Yeah these memo items are a bit of a mystery. There doesn't seem to be an obvious single reference to point to... (I named them sector "1.D" because that is how they are designated in the CRTs, but this doesn't exist in the docs, e.g. www.ipcc-nggip.iges.or.jp/public/2019r...)
ipcc-nggip.iges.or.jp
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William F. Lamb @wflamb.bsky.social · 24/04/2026
😧 Now do it for electric vehicle, heat pump, solar pv and healthy diet adoption
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William F. Lamb @wflamb.bsky.social · 24/04/2026
Which could be interesting for policy analysis as we head into more supply shocks... github.com/lambwf/Tidy-...
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William F. Lamb @wflamb.bsky.social · 24/04/2026
This means you can figure out more precisely the share of different fossil fuels in total national GHG emissions... github.com/lambwf/Tidy-...
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William F. Lamb @wflamb.bsky.social · 24/04/2026
I have updated Tidy GHG Inventories - a dataset of greenhouse gas emissions based on country submissions to the UNFCCC. Summary figures: lambwf.github.io/Tidy-GHG-Inv... Dataset: zenodo.org/records/1969... This version has much more detailed energy sector data⚡including the split by fossil fuel 🛢️
lambwf.github.io
Tidy GHG Inventories
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Robbie Andrew @robbieandrew.bsky.social · 09/04/2026
Back in 2020, I wrote a big paper that explained why different datasets of global fossil CO₂ emissions gave different numbers. 📢Now @wflamb.bsky.social has hand-picked a crowd of experts and gone much further: "Differences in anthropogenic greenhouse gas emissions estimates explained", out today.
essd.copernicus.org
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Glen Peters @glenpeters.bsky.social · 10/04/2026
We have a pretty good understanding of the differences between GHG emission estimates, but when it comes to some sectors (e.g., land), estimates seem all over the place! Why is this? @wflamb.bsky.social has you covered... essd.copernicus.org/articles/18/... 1/
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Stephan Lewandowsky @lewan.uk · 09/04/2026
🧵 New report just dropped 🚨 "Fractured Reality: How Democracy Can Win the Global Struggle Over the Information Space" — from the EU Joint Research Centre, led by Mario Scharfbillig and I. A landmark read for anyone working on disinformation, platforms & democracy. 👇 1/10
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Helen Pearson @helenpearson.bsky.social · 18/02/2026
“We can’t be shrinking away from this space,” say the scientists combating misinformation by taking strategies from the influencer playbook. Good feature on what's involved in getting very online by @catrionaclarke.bsky.social @nature.com www.nature.com/articles/d41...
nature.com
The science influencers going viral on TikTok to fight misinformation
Scientists and medical experts are countering climate denialism, vaccine scepticism and wellness pseudoscience on social media.
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Carbon Brief @carbonbrief.org · 19/01/2026
NEW – Analysis: UK newspaper editorial opposition to climate action overtakes support for first time | @joshgabbatiss.bsky.social @sylviahayes.bsky.social Read here: buff.ly/eAPkvkx
Number of UK newspaper editorials arguing for more (blue) and less (red) climate action, 2011-2025. Some editorials also present a “balanced” view, which is categorised as advocating for neither “more” nor “less” climate action. These editorials are not represented in this chart. Source: Carbon Brief analysis.
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PIK_climate @pik-potsdam.bsky.social · 08/12/2025
PIK at #IPCC: Nine PIK scientists joined the first Lead Authors’ Meeting for the 7th Assessment Report on the state of climate science in Paris last week. The meeting marked the start of drafting the 3 Working Group reports: www.pik-potsdam.de/en/news/late... @ipcc.bsky.social @wflamb.bsky.social
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William F. Lamb @wflamb.bsky.social · 24/11/2025
I think one line of evidence for this is the scale of backlash that fossil interests have mobilised against existing and working climate policies - and what happens to renewables, counterfactual emissions, etc. when they get shutdown!
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Ketan Joshi @ketanjoshi.co · 24/11/2025
It's funny to have to make this case but tbqh we don't make it enough: human efforts to counter fossil fuel use have had *at least some* effect on total greenhouse gas emissions since the signing of the Paris Agreement in 2015, and there's some evidence to back up this position A lil thread 🧵
media.tenor.com
a man is talking about being entirely successful .
Alt: a robot is is talking about not being entirely successful .
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William F. Lamb @wflamb.bsky.social · 07/11/2025
@johnfocook.bsky.social is the man to ask! Especially: skepticalscience.com/debunking-ha...
skepticalscience.com
The Debunking Handbook 2020: Downloads and Translations
In November 2011, we published The Debunking Handbook. As the update notice on that page already shows, more research has come in since then and the time had finally come for a complete overhaul of th...
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William F. Lamb @wflamb.bsky.social · 06/11/2025
Fixed, thanks. I guess firefox doesn't like svgs :(
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William F. Lamb @wflamb.bsky.social · 06/11/2025
Might be best to just exclude it from this figure next time and save writing A LOT of explanatory/hedging text that then gets lost!
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Reposted by William F. Lamb
UN Environment Programme @unep.org · 04/11/2025
New national climate plans have barely moved the needle on limiting global warming. Yet there is hope. According to UNEP's latest #EmissionsGap Report, accelerated adoption of renewable energy and falling costs mean we have the tools to cut emissions now: www.unep.org/news-and-sto...
Illustration of a dart missing the bullseye on a colorful target, symbolizing global temperature goals at risk due to inaction.
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William F. Lamb @wflamb.bsky.social · 30/10/2025
thanks - very useful!
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PIK_climate @pik-potsdam.bsky.social · 21/08/2025
Expertise from the Potsdam Institute. 8 Lead Authors for @IPCC_CH #AR7: nico bauer Niklas Boers Franziska Piontek Iulii Didovets Barbora Sedova @wflamb.bsky.social Jan Minx Elmar Kriegler First Lead Author meeting Dec 2025, report out 2028/29. www.pik-potsdam.de/en/news/late...
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Prof Friederike Otto @frediotto.bsky.social · 09/07/2025
About 1500 of the approx. 2300 people that will have lost their lives across 12 European cities last week would still live, if it wasn't for our burning of oil, coal and gas. If we care about the right to life, we need to stop burning fossil fuels. www.imperial.ac.uk/grantham/pub...
bar chart showing deaths associate with extreme heat with and without climate change in 12 European cities
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Matthias Schmelzer @matthiasschmelzer.bsky.social · 24/06/2025
Out today: Freedom for Capital not People: The Mont Pèlerin Society and the Origins of the Neoliberal Monetary Order @versobooks.bsky.social
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PIK_climate @pik-potsdam.bsky.social · 23/06/2025
Höhepunkt der Emissionen noch nicht erreicht - Tagesschau Online berichtet über Report „Indikatoren des globalen Klimawandels“. Es werde immer schwieriger, die 1,5 Grad noch zu halten, je länger Emissionen nicht reduziert würden, so PIK Forscher @wflamb.bsky.social www.tagesschau.de/wissen/klima...
tagesschau.de
Höhepunkt der CO2-Emissionen noch nicht erreicht
Während Delegierte aus aller Welt in Bonn die nächste Klimakonferenz vorbereiten, offenbart ein neuer Bericht die fragile Lage des Weltklimas. Die Forderungen nach einem Umsteuern werden immer lauter....
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William F. Lamb @wflamb.bsky.social · 16/06/2025
😆oops
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William F. Lamb @wflamb.bsky.social · 16/06/2025
And Thailand
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William F. Lamb @wflamb.bsky.social · 16/06/2025
Some impressively complete data from Nepal in the latest version
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William F. Lamb @wflamb.bsky.social · 16/06/2025
Just did a small update of Tidy GHG Inventories: lambwf.github.io/Tidy-GHG-Inv... 81 countries have now submitted inventory data with their Biennial Transparency Reports. Quite a few still haven't (its 6 months past the deadline btw).
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William F. Lamb @wflamb.bsky.social · 20/05/2025
Having said that, including LULUCF in total emissions only changes the recent trend in a few isolated cases (top left, bottom right). But we can probably expect to see more European countries enter the "slower reductions" zone as natural disturbances cut into the land sink.
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William F. Lamb @wflamb.bsky.social · 20/05/2025
The land use change (LULUCF) sector is pretty confusing, since it can be a source of emissions (deforestation, disturbances) as well as a source of removals (regrowth, management). Including LULUCF can speed up, slow down, or change the overall dynamic of economy-wide emissions.
A dot plot comparing the change in national GHG emissions over the past 5 years with (x axis) and without (y axis) the LULUCF sector
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Leo Hickman @leohickman.carbonbrief.org · 15/05/2025
Quite possibly the biggest climate story of the year (especially when we look back on this in a few years' time) For the first time on record, China's emissions are falling due to clean energy growth, not slow power demand...
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Glen Peters @glenpeters.bsky.social · 25/04/2025
Will Lamb @wflamb.bsky.social has pulled the troops together & submitted an article to explain why different datasets can give different estimates of GHG emissions. My favourite: differences in accounting for fire emissions. Article in review, please comment! essd.copernicus.org/preprints/es...
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Chris Smith @cjsmith.eu · 24/04/2025
New preprint: differences in anthropogenic greenhouse gas emissions explained essd.copernicus.org/preprints/es...
essd.copernicus.org
Differences in anthropogenic greenhouse gas emissions estimates explained
Abstract. We examine differences in global and national greenhouse gas (GHG) emissions estimates and highlight the important role of varying system boundaries and conceptual approaches in driving thes...
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William F. Lamb @wflamb.bsky.social · 24/04/2025
Greenhouse gas emissions are still mostly from fossil fuels by the way!! lambwf.github.io/UNEP-Gap-Rep...
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Glen Peters @glenpeters.bsky.social · 22/04/2025
The EU has released its latest GHG emission inventory, with data up to 2023. The good news, GHG emissions continue a downward trend, currently 37% below 1990 levels. The bad news, a significant downward revision of land-use removals (LULUCF). 1/
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William F. Lamb @wflamb.bsky.social · 18/04/2025
I tried
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Sharon Lerner @fastlerner.bsky.social · 16/04/2025
So the US was supposed to report its greenhouse gas emissions to the UNFCCC yesterday. For the first time since 1997, it didn't. This follows last week's revelation that Trump's EPA is stopping collection of GHG emission from 40 of 41 sectors www.propublica.org/article/trum...
propublica.org
Trump’s EPA Plans to Stop Collecting Greenhouse Gas Emissions Data From Most Polluters
Climate experts expressed shock and dismay at the move. “It would be a bit like unplugging the equipment that monitors the vital signs of a patient that is critically ill,” one said.
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William F. Lamb @wflamb.bsky.social · 16/04/2025
I find these quite useful for explaining trends, but it seems to me there is a lot going on behind the scenes in counterfactual estimates. I'd like to see more literature on it, in case anyone has some leads...
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William F. Lamb @wflamb.bsky.social · 16/04/2025
And here one on energy demand from @ember-energy.org ember-energy.org/latest-insig...
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William F. Lamb @wflamb.bsky.social · 16/04/2025
Interesting that people are starting to incorporate these counterfactuals in their emissions reporting. Here's a similar take from the @iea.org www.iea.org/reports/glob...
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William F. Lamb @wflamb.bsky.social · 16/04/2025
According to Carbon Monitor, emissions could have been 9.8GtCO2 higher in 2024... if renewable energy supply had been met with expected fossil sources instead www.nature.com/articles/s43...
nature.com
Global carbon emissions and decarbonization in 2024 - Nature Reviews Earth & Environment
Global CO2 emissions in 2024 increased 0.9% on the previous year, totalling 36.3 Gt CO2. These ongoing emissions further deplete remaining carbon budgets, with some estimates suggesting the 1.5 °C bud...
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William F. Lamb @wflamb.bsky.social · 09/04/2025
Lots more figures here: lambwf.github.io/Tidy-GHG-Inv...
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William F. Lamb @wflamb.bsky.social · 09/04/2025
I've updated the Tidy GHG Inventories dataset, which is now complete for Annex I countries: doi.org/10.5281/zeno... This also shows the progress to date in countries submitting Biennial Transparency Reports under the Paris Agreement ⬇️
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Dave Vetter @davidrvetter.bsky.social · 08/04/2025
Prominent climate communicators continue to "joke" that what Trump is doing is "degrowth". It is not, and such claims are actively harmful. A quick🧵
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William F. Lamb @wflamb.bsky.social · 28/03/2025
You may also like: lambwf.github.io/UNEP-Gap-Rep... lambwf.github.io/Tidy-GHG-Inv...
lambwf.github.io
UNEP Emissions Gap Report 2024 - Chapter 2 Figures
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Timothy Snyder @timothysnyder.bsky.social · 24/03/2025
If you accept that non-citizens have no right to due process, you are accepting that citizens have no right to due process. All the government has to do is claim that you are not a citizen; without due process you have no chance to prove the contrary.
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William F. Lamb @wflamb.bsky.social · 14/03/2025
😬
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