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Flavio Lehner

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H-index: 53
Environmental science 55%
Geography 18%
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Reposted by: Flavio Lehner, Anthony Ricciardi, Justin H. Kirkland , and 5 more

kevinjkircher.com
Sometimes I think about how from 1935-1975ish, Bell Labs produced an insane amount of revolutionary science and technology, including 11 Nobel Prizes, the transistor, UNIX, C, the laser, the solar cell, information theory, etc. The secret? Provide scientists with ample, steady, no-strings funding.
sites.stat.columbia.edu
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by Flavio Lehner

climateflavors.bsky.social
Fyi, you can have global entry with only a greencard.

Fingers crossed you don’t have to have any such discussion.
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Reposted by: Flavio Lehner

natetwnclimate.bsky.social
If there is one piece of good news regarding our planet's future, it's our ozone layer and ongoing shrinking of its hole. New @wmo-global.bsky.social report said Earth's protective ozone layer is healing and the hole in 2024 was smaller than in recent years. www.theweathernetwork.com/en/news/clim...
Smaller ozone hole in 2024 pushes Earth closer to seeing it vanish - The Weather Network
A new World Meteorological Organization (WMO) report offers good news about Earth's ozone layer, which is on the road to a recovery to 1980 values in the coming decades--a positive sign for the health...
www.theweathernetwork.com
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Reposted by: Flavio Lehner

weatherprof.bsky.social
This is why two hurricanes can not merge into a monster.
Watch as #Imelda’s growing outflow and sinking air impinges on #Humberto’s core, likely soon leading to weakening. Systems are now under 600 miles apart.
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Reposted by: Flavio Lehner, Peter Thorne, Colin Murray , and 6 more

benmsanderson.bsky.social
Paris-Berlin sleeper: low carbon, 2 years old, constantly full, but currently losing SNCF a few million EUR/yr

Intl Jet fuel tax exemptions are 80 years old and cost the EU 22 million EUR/yr for the Paris-Berlin route alone.

And you're cutting... the sleeper?

www.theguardian.com/travel/2025/...
It’s goodnight Vienna as Paris sleeper train to Austria and Berlin hit by cuts
Some Nightjet services suspended from mid-December after French withdrawal amid public budget crisis
www.theguardian.com
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Reposted by: Flavio Lehner, Anna O. Law, Marc Lynch , and 19 more

djvanness.bsky.social
A lot of people think that every international student admitted means one fewer spot for domestic students, when the opposite is more likely true - the tuition revenue international students bring allows public universities to provide substantial discounts to domestic students, improving access.
nickfleisher.bsky.social
Nick Fleisher @nickfleisher.bsky.social · 8d
30% drop year over year!
Amid visa restrictions, international freshmen enrollment plummets at UW-Madison
This year’s number of international freshmen is the lowest recorded since at least 2015.
www.jsonline.com
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Reposted by: Flavio Lehner, Joshua S. Weitz, Silvia Secchi , and 1 more

omfishient.bsky.social
🧪 Were you one of the many thousands of STEM students (and mentors) impacted by the sudden change in #NSF #GRFP eligibility last week?

We created a petition to NSF leadership and Congress to reverse the changes - please sign and share your stories here!!

laurenkuehne.github.io/grfpChanges/
Petition to NSF to Restore Eligibility for the 2026 Graduate Research Fellowship Program Competition
laurenkuehne.github.io
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Reposted by: Flavio Lehner

cristiproist.bsky.social
New paper out. In which we helped the folks at the Allen Institute for AI (AI2) show that their climate emulator does a good (though not perfect) job at reproducing E3SMs' response to different SST boundary conditions.

1/

agupubs.onlinelibrary.wiley.com/doi/full/10....
Applying the ACE2 Emulator to SST Green's Functions for the E3SMv3 Global Atmosphere Model
The Ai2 Climate Emulator broadly captures the top-of-atmosphere (TOA) radiative response to local sea surface temperature (SST) anomalies ACE and EAMv3's global TOA radiation sensitivity to all S...
agupubs.onlinelibrary.wiley.com
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Reposted by: Flavio Lehner, A. E. Dessler, Gavin A. Schmidt

agu.org
📢 Submissions are now open for the U.S. Climate Collection, a joint @theAGU + @ametsoc initiative.

This special collection will publish U.S.-focused climate assessment science that’s free to read, ensuring rigorous, accessible science informs decisions for years to come.

🔗 buff.ly/1tHUSLC
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by James Goodwin — Reposted by: Flavio Lehner, Gavin A. Schmidt, James Goodwin

jamesgoodwin.bsky.social
"... Zeldin intends to sign off next week on the final policy and legal justifications for repealing the so-called endangerment finding and Biden-era climate rules for cars and trucks... before agency staff have time to sift through all public comments...." subscriber.politicopro.com/article/eene...
E&E News: Internal docs: Zeldin races ahead without analysis in endangerment rollback
The EPA administrator plans to sign off on the repeal's policy and legal justifications before his staff finishes the regulatory impact analysis.
subscriber.politicopro.com
6 29 41

Reposted by: Flavio Lehner, A. E. Dessler, Ben Bond‐Lamberty , and 10 more

climate.us
🚨 NCA5 is now LIVE! 🚨

They took it down, but we've brought it back at: nca5.climate.us

Bookmark. 👏 this. 👏 page. 👏

This is just our first step in restoring trusted science information that Americans need to understand what's happening with the climate.
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Reposted by: Flavio Lehner, Michael Wagner, Johannes Quaas , and 8 more

hausfath.bsky.social
In a UN speech today, President Trump said that "all of these [climate] predictions were wrong".

Back in 2019 I led a research effort to digitize old climate model projections and assess how well they did. Turns out they got future warming pretty spot on!
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by Flavio Lehner

climateflavors.bsky.social
Sorry, I meant 5.0.2...
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by Flavio Lehner

climateflavors.bsky.social
Thanks and nice to see this, Tim! What's happening over North America in CRUTEM 5.1 minus 5.2? Just random variations in stations reporting or something more systematic?
1

Reposted by: Flavio Lehner, John Kennedy, Peter Thorne , and 3 more

timosbornclim.bsky.social
After a brief (ahem) hiatus, the HadCRUT5 global temperature dataset has now been updated to June 2025 by @metoffice.gov.uk @climateuea.bsky.social and @ncas-uk.bsky.social
1850-2025 time series of global mean temperature anomaly from the HadCRUT5 dataset.
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Reposted by: Flavio Lehner

cristiproist.bsky.social
#realktalk though, when is the deadline for papres to be accepted to be considered for AR7?
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Reposted by: Flavio Lehner, A. E. Dessler, Kevin J. Anchukaitis

cristiproist.bsky.social
ECS <2 is absurd in the year of our lord 2025.

The data used in Sherwood et al is now almost a decade old (not to mention Lewis and Curry 2014).

Even ignoring pattern effects, we’re now already at ~1.5C with less than 2xCO2 and an even larger energy imbalance.

No way Effective ECS is <2.
kenrice.bsky.social
Ken Rice @kenrice.bsky.social · 17d
But it's not just uniform vs Jeffreys. There are other priors and there are other ways to estimate ECS. As Andrew points out, if your method suggest a good chance of the ECS being < 2K, then there's probably an issue with the method, or it's at least worth considering this.
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Reposted by: Flavio Lehner

scottstgeorge.paleohydrology.com
Yet another Nat Cat job? Actually, we're searching for TWO experts, specialized in tropical cyclones or earthquakes. US or UK, remote work definitely an option. Great job for an ECR physical scientist looking to join the insurance/reinsurance industry! eedu.fa.em3.oraclecloud.com/hcmUI/Candid...
Natural Catastrophe Analyst - Earthquake/Hurricane Specialist
An exciting opportunity to join an established research network team at Willis (a WTW business), helping clients understand and manage risk while shaping the Willis “view of risk.” Using your scientif...
eedu.fa.em3.oraclecloud.com
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by Flavio Lehner

climateflavors.bsky.social
Idk of an online source for that specific data but I should have the global means lying around somewhere. Can you send me an email?

The full data is available via MMLEA or ESGF but that's a pain if you just need global mean.
www.cesm.ucar.edu/community-pr...
aims2.llnl.gov/search/cmip6/
Multi-Model Large Ensemble Archives | Community Earth System Model
www.cesm.ucar.edu
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by Sonia I. Seneviratne — Reposted by: Flavio Lehner, Felix Creutzig, Jakob Zscheischler , and 1 more

soniaseneviratne.bsky.social
Es ist eine grosse Ehre, den 2025 Deutschen Umweltpreis zu erhalten! Danke an alle meine jetzigen und ehemaligen Gruppenmitglieder und viele Kolleg:innen!
@lukasgudmundsson.bsky.social @yasserhaddad.bsky.social @yannquilcaille.bsky.social @michaelgwindisch.bsky.social @usyseth.bsky.social
umweltstiftung.bsky.social
DBU Deutsche Bundesstiftung Umwelt @umweltstiftung.bsky.social · 26d
Ausgezeichnet!🏆Mit dem Deutschen Umweltpreis 2025 von der DBU #uwp25 werden die Klimaforscherin @soniaseneviratne.bsky.social @ethz.ch & das Geschäftsführungsduo Lars Baumgürtel und Dr. Ing. Birgitt Bendiek des Stahlverzinkungsunternehmens ZINQ geehrt. buff.ly/QEDIjX0
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Reposted by: Flavio Lehner, Brigitte Nerlich, Richard Betts

maibached.bsky.social
Every avoidable death is a tragedy. Smoke from Canada’s wildfires killed nine-year-old Carter Vigh – and 82,000 others around the world. #EndFossilFuels.

@gchalliance.bsky.social
@docsforclimate.bsky.social
@fossilfueltreaty.bsky.social
Smoke from Canada’s wildfires killed nine-year-old Carter Vigh – and 82,000 others around the world
Toxic particles spewed by 2023’s wildfires were even responsible for 22,000 early deaths in Europe, researchers say
www.theguardian.com
1 16 41

Reposted by: Flavio Lehner, Katharine Hayhoe, John Quiggin , and 2 more

hausfath.bsky.social
The current administration has claimed renewables are making the grid less reliable. If that were the case, I'd expect states adding the most renewables over the past decade to have the largest increase in outages.

However, the opposite seems to be true!
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by Flavio Lehner

climateflavors.bsky.social
It's Reviewer classics week:
- This work is not novel but I can't provide literature to back up my verdict.
- While you have now included all the datasets that I asked you to, you are still not considering enough datasets.
- Do this analysis that you already did (in the supplement).
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Reposted by: Flavio Lehner

natetwnclimate.bsky.social
Thanks to @climateflavors.bsky.social of @polarbearsinternational.org for the chat, help with this. With the Arctic's sea ice loss a worrisome trend, projections continue to indicate when the region could see its first instance of individual, ice-free day. www.theweathernetwork.com/en/news/clim...
Arctic may see single occurrences of ice-free days sooner than predicted - The Weather Network
A recent study presents an alternate take on when the Arctic could see individual instances of ice-free days, with models pinpointing a quicker timeline for than previously thought--as early as this d...
www.theweathernetwork.com
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by A. E. Dessler — Reposted by: Flavio Lehner, Katharine Hayhoe, Valerie M. Delmotte , and 14 more

andrewdessler.com
Our 400+ page comment on the DOE climate working group report is now out.

Our conclusion: The merchants of doubt are back, and they're coming for climate science.
DOEresponseSite
On July 29, 2025, the Department of Energy (DOE) published a report from its Climate Working Group (CWG). This report features prominently in the EPA's reconsideration of its 2009 Endangerment Finding. In response, over 85 scientists have come together to write a comprehensive review, which is
sites.google.com
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Reposted by: Flavio Lehner, Dorothy Bishop, Gavin A. Schmidt , and 9 more

adzebill.bsky.social
Wikipedia editors trying to fend off the onslaught of AI crap have crowdsourced some telltale signs of LLM-generated writing; it might be handy for editors and proofreaders generally. Thanks to @ellenrykers.com for pointing me to it. en.wikipedia.org/wiki/Wikiped...
Wikipedia:Signs of AI writing - Wikipedia
en.wikipedia.org
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by Jakob Zscheischler — Reposted by: Flavio Lehner, Rohini Kumar

zscheischlerjak.bsky.social
Our new study on how large floods will change in Europe under climate change, led by @bfang.bsky.social, with @bevacquae.bsky.social
commsearth.nature.com
Communications Earth & Environment @commsearth.nature.com · Aug 29
❄️🌧️Reduced snowmelt dominates changes in Northern Europe's largest floods, while heavy precipitation dominates Western Europe flood events.

@bfang.bsky.social @zscheischlerjak.bsky.social

👉Read more here:
www.nature.com/articles/s43...
Diverging trends in large floods across Europe in a warming climate - Communications Earth & Environment
Reduced snowmelt dominates northern Europe’s largest floods variation while heavy precipitation dominates western Europe flood events, according to a joint assessment of changes in the timing, spatial...
www.nature.com
1 6 18

by A. E. Dessler — Reposted by: Flavio Lehner, Katharine Hayhoe, Paul Dorfman , and 16 more

andrewdessler.com
Our comment on the DOE CWG report is done. It tips the scales at 439 pages, approx. 3x longer than the DOE report.
This is related to Brandolini's law: The amount of energy needed to refute bullshit is an order of magnitude bigger than that needed to produce it.

Example: refuting one sentence.
DOE CWG STATEMENT (second paragraph of section 2.1.1, page 3): “Piao et al. (2020) noted that greening was even observable in the Arctic.” COMMENT: This statement implies that the Arctic greening signal was caused by elevated CO2 , however that is not the scientific consensus. Piao et al. (2020) attribute the greening trend in the Arctic predominantly to growing season length driven by warmer temperatures (see also Y. Zhang et al., 2022). Piao et al. (2020) also note that this positive impact of increasing temperatures appears to have weakened over the past four decades, “suggesting a possible saturation of future greening in response to warmer temperature” (see also comment on greenness trends related to Section 2.1.1, first sentence of Page 4). It is also important to put Arctic greening more broadly into the context of the carbon cycle and other impacts. While above-ground plants may have displayed more leaf area over the past decades, rising temperatures also thaw permafrost and drive accelerated decomposition in highly carbon rich soils (Turetsky et al., 2020), a process which is expected to accelerate as climate continues to warm (Miner et al., 2022). Thus even with Arctic greening, high latitude terrestrial systems may become net carbon sources to the atmosphere, causing an amplifying feedback (Braghiere et al., 2023). Other risks to the Arctic linked to higher CO2 levels and rising temperatures are not mentioned in this report (Virkkala et al., 2025). The Arctic is warming at a rate of 2 to 3 times the global average, leading to thawing of permanently frozen soils (permafrost), with downstream impacts including loss of structural support for buildings and subsidence, threatening communities, roads, runways, and other assets across Alaska (Manos et al., 2025; University of Alaska Fairbanks Institute of Northern Engineering US Army Corps of Engineers Alaska District & Laboratory, 2019).
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by Kevin J. Anchukaitis — Reposted by: Flavio Lehner

thirstygecko.bsky.social
I raise this point frequently - we're not even well-adapted to the weather and climate extremes we already experience ('adaptation deficit', a la Burton 2009). Addressing that would go a meaningful way toward reducing total vulnerability to future climate changes www.pnas.org/doi/10.1073/...
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Reposted by: Flavio Lehner, Peter Thorne, Mark Lubell , and 4 more

voosen.me
My latest: The Trump administration is not waiting for the next fiscal year -- or Congress -- to cut climate science at NOAA. A new document details the money it won't spend *this* year on climate research.
Trump administration pushes ahead with NOAA climate and weather cuts
Despite congressional resistance, agency aims to cut research spending now
www.science.org
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