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Dan Visioni

@danvisioni.bsky.social
2.3K followers 653 following 2.9K posts

Climate scientist studying aerosols, chemistry, radiation, climate & society from Volcanoes 🌋and Climate Intervention. Assistant Professor at Cornell EAS, from 🇮🇹proudly🏳️‍🌈 More at dan-visioni.github.io and www.wcrp-climate.org/ci-overview

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Reposted by Dan Visioni
Dan Visioni @danvisioni.bsky.social · 28/09/2026
Super excited to present this! We discussed this for the first time at Climate Week ~2 years ago, and it's amazing now that is seeing the light of day!!
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Dan Visioni @danvisioni.bsky.social · 28/09/2026
Super excited to present this! We discussed this for the first time at Climate Week ~2 years ago, and it's amazing now that is seeing the light of day!!
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Reposted by Dan Visioni
CarbonPlan @carbonplan.org · 28/09/2026
Analyzing the impacts of stratospheric aerosol injection (SAI) requires climate data at finer spatial resolution than global models provide. We’re releasing an open-source, downscaled SAI dataset to support SAI impacts research and to expose uncertainties associated with downscaling itself.
carbonplan.org
Data to evaluate the regional impacts of stratospheric aerosol injection – CarbonPlan
Releasing downscaled versions of stratospheric aerosol injection simulations, alongside tools to make it accessible.
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Dan Visioni @danvisioni.bsky.social · 18/09/2026
How my inbox feels today:
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Dan Visioni @danvisioni.bsky.social · 17/09/2026
Nobody in the academic community deserves more contempt than those thinking that playing the China scare is how they’ll keep getting US government money.
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Dan Visioni @danvisioni.bsky.social · 13/09/2026
This applies to the Rust Belt and to Earth Science departments everywhere.
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Reposted by Dan Visioni
Dan Visioni @danvisioni.bsky.social · 11/09/2026
gmd.copernicus.org/articles/19/... As part of the new CMIP7 iteration, the GeoMIP community has published our plans for the new set of modeling experiments. We document the discussions held during the last annual meetings, explain our motivations for the scenario choices with transparency and…
gmd.copernicus.org
The Geoengineering Model Intercomparison Project (GeoMIP) contribution to CMIP7 – description of new experimental protocols and preliminary results
Abstract. The Geoengineering Model Intercomparison Project (GeoMIP) is a coordinated international model intercomparison effort with the aim of providing robust experimental protocols for simulations ...
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Reposted by Dan Visioni
Dan Visioni @danvisioni.bsky.social · 11/09/2026
If we trained an LLM on all scientific literature up to point t, with t the time of a massive scientific advancement in the physics of the 19th century, would the LLM eventually get to it?
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Dan Visioni @danvisioni.bsky.social · 11/09/2026
I've often wondered if many big scientific breakthroughs in physics were not somewhat inevitable, in the sense that scientific understanding was mature enough that *eventually* they were going to be discovered by someone. Planck's law comes to mind. Maxwell's equations too. Hence the question:
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Dan Visioni @danvisioni.bsky.social · 11/09/2026
gmd.copernicus.org/articles/19/... As part of the new CMIP7 iteration, the GeoMIP community has published our plans for the new set of modeling experiments. We document the discussions held during the last annual meetings, explain our motivations for the scenario choices with transparency and…
gmd.copernicus.org
The Geoengineering Model Intercomparison Project (GeoMIP) contribution to CMIP7 – description of new experimental protocols and preliminary results
Abstract. The Geoengineering Model Intercomparison Project (GeoMIP) is a coordinated international model intercomparison effort with the aim of providing robust experimental protocols for simulations ...
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Dan Visioni @danvisioni.bsky.social · 10/09/2026
Trying not to look at too many comments to preserve my sanity and my working day, but just to say: 1) yes, we published this. I'm very proud of the large amount of work many people put into it! 2) this is our v1. We engaged many external people, and will always be looking for meaningful feedback
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Reposted by Dan Visioni
James Temple @jtemple.bsky.social · 10/09/2026
There are still big unknowns about solar geoengineering: Reflective has just released a road map of the studies & experiments needed to reduce that uncertainty — and make an "informed decision" about its use:
technologyreview.com
This road map could help us decide whether to deploy solar geoengineering
A new report from the nonprofit Reflective lays out the experiments needed to better understand our ability to dim the sun.
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Dan Visioni @danvisioni.bsky.social · 07/09/2026
Editorial staff of a [serious] journal in May: “Hi! We’d like you to write an intro for our special issue. We’d need smtg by August” Me: “Cool, I might. Here’s some qs to help me understand and write something decent” Them: no reply ever even after follow ups Them today: WHERE’S OUR PIECE YOU DOG
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Reposted by Dan Visioni
Dan Visioni @danvisioni.bsky.social · 05/09/2026
But at the time of crossing a threshold into overshoot, you don’t yet know 1) if you can scale CDR, 2) how much, so how high is your peak 3) how fast, so how long is your peak and decline and 4) exactly how dangerous staying for X time above Y temperature would be. Then your SRM problem becomes
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Reposted by Dan Visioni
Dan Visioni @danvisioni.bsky.social · 05/09/2026
Since that doesn’t reduce cumulative carbon, even if you do those but overshoot, you’re left at whatever GWL even at net-zero emissions. Then your decision around long term commitment over net-negative emissions (assuming you can do them) is “is adapting at whatever GWL easier than coming back down”
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Reposted by Dan Visioni
Dan Visioni @danvisioni.bsky.social · 05/09/2026
What I’d answer here is that the 3 things are different from a temporal perspective, and so it’s not a matter of picking one. Rather, based on their temporality, one can better identify the risk trade-offs. Deep methane cuts could be done quickly, they’re great, but “only” reduce the rate of warming
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Dan Visioni @danvisioni.bsky.social · 06/09/2026
There is no escaping fascism by running away from it in 2026. Post Trump 2 there was a lot of scolding “just move back to EU”. Aside from the practical impossibilities -people move based on lots of reasons- that same black wave is threatening EU, too. AfD winning doesn’t make me giddy, just sad.
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Reposted by Dan Visioni
Joshua Foust 🪖🎮 @joshuafoust.com · 04/09/2026
The real threat to academic freedom isn’t a Belgian university enforcing its own rules against an avowed white supremacist, but from predators purging their victims from the academy all together. Weird that this doesn’t inspire 600+ signatories in an open letter; I wonder what principle is at work.
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Dan Visioni @danvisioni.bsky.social · 05/09/2026
How dare your fire management plan talk about the fact there should be more and better hydrants. It should just be 70 pages all caps yelling at people they should avoid causing fires. You must be in the pockets of Big Fire.
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Dan Visioni @danvisioni.bsky.social · 02/09/2026
The problem with the (very true) phrase “Hope is not a plan” is that it’s very easy to then categorize whatever solution one prefers as “concrete, down the Earth things that would obviously happen if only political will materialized” and everything else as “naive nonsense only a fool could believe”
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Reposted by Dan Visioni
Alejandro Fábregas-Tejeda @alejandrofabregastejeda.com · 26/08/2026
In their new 📃, Ryan O’Loughlin & @danvisioni.bsky.social advance a set of heuristics for assessing the pursuitworthiness of small-scale solar geoengineering field experiments in response to shifting modeling priorities & ethico-political considerations 👇 🔗 link.springer.com/article/10.1... #philsci
The first page of a journal article from the European Journal for Philosophy of Science, titled "When are small-scale field experiments in solar geoengineering worth pursuing?" by Ryan O'Loughlin and Daniele Visioni, published in 2026.


Abstract

We propose a set of heuristics—scientific rigor, safety, usefulness, engagement, and transparency—for assessing the pursuitworthiness of small-scale field experiments in solar geoengineering research. Rather than offering a fixed logic of pursuit, we emphasize that these heuristics should operate as part of a dynamic and iterative evaluative process within the solar geoengineering research community, responsive to changing modeling priorities, new data, and shifting ethical and political landscapes. We argue that such experiments must be understood within the broader context of climate modeling research, where their primary role is to improve model components and identify further uncertainties. Our analysis assumes, rather than argues for, the pursuitworthiness of solar geoengineering research as a whole. However, we conclude this work by revisiting the overarching question of whether solar geoengineering research itself is worth pursuing; we argue that accounts that focus on how research governance can reduce bias and build stable scientific norms offer a more promising route than appeals to urgency or “moonshot” missions. Overall, we provide a structured framework, situated within scientific practice, that can help determine which field experiments are worth undertaking and why.
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Dan Visioni @danvisioni.bsky.social · 24/08/2026
In the year of our lord 2026, if your paper still has “data and code available from the authors upon reasonable request” there should be an automatic poop emoji next to your OrcID icon.
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Dan Visioni @danvisioni.bsky.social · 23/08/2026
Sorry I can’t sign your well meaning letter “Let people do a lil’ race science, as a treat, because Freedom”. I’m currently busy trying to figure out which common words have been secretly banned by the US government if you want to get federal funding. You know, words like “climate” and “diverse”.
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Reposted by Dan Visioni
Bulletin of the Atomic Scientists @thebulletin.org · 14/08/2026
A new study suggests climate models may be overestimating how much carbon forests will absorb in a warming world, raising the possibility that global temperatures could rise even more than current projections anticipate, writes Jessica McKenzie @jessimckenzi.bsky.social.
thebulletin.org
A blind spot in climate models: Slower tree growth in a warming world
New study finds Earth system models could be overestimating future carbon storage in forests by up to 30 percent.
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Dan Visioni @danvisioni.bsky.social · 12/08/2026
I've thankfully not had to worry about asking for letters of recommendations for faculty positions for three years, and now that I have been asked to write some, I am suddenly reminded of the stupid, ridiculous request of some dept to ask four fucking letter of recommendation at the first stage.
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Dan Visioni @danvisioni.bsky.social · 10/08/2026
Great collaborative paper out with results looking at inter-model agreement in the stratospheric temperature response to Pinatubo "Assessing the stratospheric temperature response to volcanic sulfate injections by Mt. Pinatubo: insights from ISAMIP" acp.copernicus.org/articles/26/...
acp.copernicus.org
Assessing the stratospheric temperature response to volcanic sulfate injections by Mt. Pinatubo: insights from the Interactive Stratospheric Aerosol Model Intercomparison Project
Abstract. Some major volcanic eruptions, such as the one of Mt. Pinatubo in 1991, can inject large amounts of sulfur dioxide (SO2) into the stratosphere, leading to a volcanic aerosol cloud. This dens...
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Reposted by Dan Visioni
Dan Visioni @danvisioni.bsky.social · 30/07/2026
With Ryan O'Loughin from CUNY, we have a paper out today in the European Journal for Philosophy of Science where we ask: "When are small-scale field experiments in solar geoengineering worth pursuing?" link.springer.com/article/10.1...
link.springer.com
When are small-scale field experiments in solar geoengineering worth pursuing? - European Journal for Philosophy of Science
We propose a set of heuristics—scientific rigor, safety, usefulness, engagement, and transparency—for assessing the pursuitworthiness of small-scale field experiments in solar geoengineering research....
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Dan Visioni @danvisioni.bsky.social · 31/07/2026
Uncertain - how, and how much, and more importantly, what are you going to do about it? I've been always very dissatisfied with statements that say "X is uncertain" - not to mention "X is *very* uncertain". Yes, but what isn't uncertain? How do we conceptualise the specific uncertainties...
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Dan Visioni @danvisioni.bsky.social · 31/07/2026
Yes well here’s my coming out: I force my husband to watch Love Actually at least once every year around Christmas.
static.klipy.com
Bill Nighy's Christmas Dance from Love Actually
ALT: Bill Nighy's Christmas Dance from Love Actually
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Dan Visioni @danvisioni.bsky.social · 30/07/2026
With Ryan O'Loughin from CUNY, we have a paper out today in the European Journal for Philosophy of Science where we ask: "When are small-scale field experiments in solar geoengineering worth pursuing?" link.springer.com/article/10.1...
link.springer.com
When are small-scale field experiments in solar geoengineering worth pursuing? - European Journal for Philosophy of Science
We propose a set of heuristics—scientific rigor, safety, usefulness, engagement, and transparency—for assessing the pursuitworthiness of small-scale field experiments in solar geoengineering research....
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Dan Visioni @danvisioni.bsky.social · 18/07/2026
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Dan Visioni @danvisioni.bsky.social · 12/07/2026
Lindsey is not going to read your mean tweets about him, but Mitch… ok but your average octogenarian senator clinging to their seat and on the brink of death might have their aide read it to them and be sad about it?
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Dan Visioni @danvisioni.bsky.social · 10/07/2026
I really like @beyondmeatofficial.bsky.social (and they're constantly getting better!) but I'll never understand why they thought that what I wanted from them was "Sparkling Protein Beverages", which is all they seem to be advertising recently in their emails. Yuk.
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Reposted by Dan Visioni
IPCC @ipcc.bsky.social · 06/07/2026
📣 IPCC opens registration for experts to review the First Order Draft of Working Group I contribution to Seventh Assessment Report. The review runs from 10 August until 2 October. Interested experts can register until 25 Sept 2026: bit.ly/4vi25cq Read more 🔗 bit.ly/WGI7Fod
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Dan Visioni @danvisioni.bsky.social · 06/07/2026
Ain’t no deadline like an IPCC deadline
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Dan Visioni @danvisioni.bsky.social · 05/07/2026
Starting to develop some hot takes on LLM for research. Even the best model is actually very dumb at doing brainstorming, lit review, all that. Just boring word salads - I can do better while drunk (is there any other way to do lit review?). BUT there is clearly some potential for climate science:
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Dan Visioni @danvisioni.bsky.social · 05/07/2026
It’s just an extreme form of climate adaptation, dear.
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Reposted by Dan Visioni
Evan Urquhart @evanurquhart.bsky.social · 03/07/2026
It's not appropriate for cis people to say that trans people are too alarmed, or that certain trans writers are irresponsibly causing trans people to think the sky is falling. I want to take some time in this 🧵 to write personally about how my skies have fallen.
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Dan Visioni @danvisioni.bsky.social · 03/07/2026
Excuse me how was Disclosure Day SO GOOD and nobody told me omg
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Dan Visioni @danvisioni.bsky.social · 29/06/2026
Me to my husband when he shows me the 37th postcard of the day from our BirdBuddy with a cardinal looking silly eating seeds.
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Dan Visioni @danvisioni.bsky.social · 29/06/2026
Italy’s always a bit late on the best global trends, so no wonder we still have old-school climate deniers. This guy was offered an entire page on a newspaper arguing there are no statistically significant changes in summertime temperatures in Italy. His own plot says there’s a 0.5C/decade trend.
Italian newspaper denying climate change. Title says “It’s an average June. If you don’t believe me check for yourself meteorological data”
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Dan Visioni @danvisioni.bsky.social · 28/06/2026
If first and foremost you don’t find thousands of deaths from a heatwave heartbreaking you’re a sicko.
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Dan Visioni @danvisioni.bsky.social · 26/06/2026
This was a fascinating historical read. What I am curious about is that the piece seem to heavily imply that there is a counterfactual world in which the paper would have come out anyway, but be less “sexy”, hence both public policy & academic focus would have shifted to rely more on mitigation.
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Dan Visioni @danvisioni.bsky.social · 26/06/2026
news.cornell.edu/stories/2026... Good write up of Brendan’s work by the @cornelluniversity.bsky.social Chronicle “The more we look, the clearer it becomes that with further warming it will become harder for nature to keep up”
news.cornell.edu
Getting warmer: Slower forest growth means less carbon storage | Cornell Chronicle
A new ecological discovery – that global warming is slowing tree growth – means current climate predictions could overestimate forests’ potential for carbon storage by as much as 30%.
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Dan Visioni @danvisioni.bsky.social · 20/06/2026
To be clear on what this means: this is exactly like if a climate deniers had taken someone’s paper using 4xCO2 experiment in a bunch of models and said “these people don’t even know if the climate would warm by 20 or 60C, they don’t understand anything about the climate!”.
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Dan Visioni @danvisioni.bsky.social · 20/06/2026
Looks like folks think it's ok to lie in an op-ed on @theguardian.com because cumulatively the authors have "100 years of climate science experience". I think science should not be misinterpreted to make a political point (even 1 I agree with), and what you see in the screenshot is totally false.
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Dan Visioni @danvisioni.bsky.social · 20/06/2026
But if the side of "trust in the expert"/"believe the science" is willing to lie and misinterpret scientific evidence to make a completely different point about governance (on which I largely agree!) then it doesn't fill me with extreme confidence, or pride on being part of the scientific community.
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Dan Visioni @danvisioni.bsky.social · 20/06/2026
I’m not going to link to the Guardian piece, not particularly engage with some of the things said. But as the co-chair of GeoMIP since 2019, I can tell there’s a community of scientists I’m proud to represent, that has for years called for more rigorous research acp.copernicus.org/articles/23/...
acp.copernicus.org
Opinion: The scientific and community-building roles of the Geoengineering Model Intercomparison Project (GeoMIP) – past, present, and future
Abstract. The Geoengineering Model Intercomparison Project (GeoMIP) is a coordinating framework, started in 2010, that includes a series of standardized climate model experiments aimed at understandin...
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Dan Visioni @danvisioni.bsky.social · 19/06/2026
“Nobody has ever studied this carefully” said the people who spent 10 years threatening to tank the carrier of anybody daring to studying that thing carefully and systematically. I’m going to have a brain aneurysm before 40.
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Dan Visioni @danvisioni.bsky.social · 18/06/2026
agupubs.onlinelibrary.wiley.com/doi/10.1029/... CO₂ fertilization effect? Not so fast… Some new studies have shown that increasing Vapor Pressure Deficit seems to limit tree growth. In this new work from our group, we show for the 1st time how much this would affect future estimates of tree growth…
agupubs.onlinelibrary.wiley.com
Land Models Likely Underestimate the Impact of Future Atmospheric Dryness on European Tree Growth
The land absorbs one third of human CO2 emissions, making it critical to understand how tree growth will respond to climate change Drier air reduces photosynthesis and the processes of cell divis...
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