Per Unneberg
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percyfal.bsky.social
Per Unneberg
@percyfal.bsky.social
Population genomicist. Musician. Allergic to cosmic debris.
Reposted by Per Unneberg
Impact of flights on global warming severely underestimated by many carbon calculators & offset schemes that don’t properly account for taxiing, sub-optimal routing or non-CO2 climate effects which are larger component:
www.newscientist.com/article/2502...

Research paper:
doi.org/10.1038/s432...
Your flight emissions are way higher than carbon calculators suggest
Existing tools that work out the carbon footprint of flights greatly underestimate their warming impact, say the makers of a new calculator
www.newscientist.com
November 3, 2025 at 8:12 AM
Reposted by Per Unneberg
"You can’t reboot the planet if you crash it" | My commentary on Bill Gates' flawed new climate missive for @thebulletin.org: thebulletin.org/2025/10/you-...
You can’t reboot the planet if you crash it
What Gates is putting forward aren’t legitimate arguments that can be made in good faith. They are shopworn fossil fuel industry talking points.
thebulletin.org
October 31, 2025 at 6:35 PM
Reposted by Per Unneberg
I strongly agree with this thread, with one clarification: Whether civilization will survive 3C is in my view at least an open question. Human survival is different from survival of civilization. The former is likely, even for the worst expected climate impacts, but the latter is not assured
I wanted to offer some thoughts on the Gates climate memo that has been circulating this week. While I can't directly speak for others, I can say that my own response is one of dismay & deep frustration (and that this view is shared by many climate/Earth scientists). [1/n]
October 30, 2025 at 6:07 PM
Reposted by Per Unneberg
I keep having the experience of people in this world relating to me their shock upon hearing my (pretty "mainstream") climate science perspective on these kinds of issues. So many influential people still believe a +3C warmer world is just "the exact weather from the 20th century, but 3C warmer."
October 30, 2025 at 8:18 PM
Reposted by Per Unneberg
In a 2024 paper criticizing the 'billion-dollar-disasters' database, Roger Pielke Jr. published analysis that is best described as a Russian-doll of errors.

Here's my in-depth take down of his appallingly bad work.

economicsfromthetopdown.com/2025/10/26/r...
Roger Pielke Jr.’s Appallingly Bad Analysis of Billion Dollar Disasters – Economics from the Top Down
In a recent paper called Scientific integrity and U.S. “Billion Dollar Disasters”, Roger Pielke Jr. published a chart that's so bad I've devoted a whole essay to debunking it.
economicsfromthetopdown.com
October 26, 2025 at 3:24 PM
Reposted by Per Unneberg
This well-made documentary series is asking the questions we should all be.

Given that it's FREE to view, it would make an excellent starting point for discussions in schools, universities, and community centres.

Highly recommended.
Global Warning: Ep 2 Against the tide.
How do we adapt to what is coming?

The nice people at Al Jazeera have made this series free to watch. I hope you all share it widely.
#Climate #ClimateCrisis #PublicServiceBroadcasting

📺 👉 www.aljazeera.com/video/featur...
October 18, 2025 at 10:42 AM
Reposted by Per Unneberg
Holy wow, +3.5 ppm CO₂ last year, up from +2.4 ppm average the past decade, and +0.6 ppm in the 1960s.

It gets scarier the closer you look at it. All this is a stress test for the planet, and it's buckling.

Two big reasons for the massive increase: wildfires, and the ocean sinks are shutting down.
October 16, 2025 at 7:02 AM
Reposted by Per Unneberg
I was honoured to be invited to give a talk on AviList, the new unified global checklist of birds, at the Delta Birding Festival 2+ weeks ago, and the organizers just sent me a link to a YouTube video of my talk: www.youtube.com/watch?v=QO5x... #birds #ornithology #taxonomy
AviList: a unified global bird checklist - Per Alström
YouTube video by Delta Birding Festival
www.youtube.com
October 6, 2025 at 7:42 PM
Reposted by Per Unneberg
Speaking of voices under attack…can we be just as loud about Black journalists and comedians who are silenced, even by our so-called liberal outlets.

• Joy Reid
• Don Lemon
• Melissa Harris-Perry
• Tiffany Cross
• Jemele Hill
• Marc Lamont Hill
• Karen Attiah
• Amber Ruffin
September 25, 2025 at 4:40 AM
Reposted by Per Unneberg
In the first seven days since I launched this new game, almost ten thousand people from 82 countries have played it. (Top cities so far: New York City, Zurich, Toronto, Chicago, Berlin, Vienna, Stockholm)

What topics would you like me to add next?

dataguessr.com
Dataguessr
Update your knowledge of the world. One quiz at a time.
dataguessr.com
September 19, 2025 at 3:17 PM
Reposted by Per Unneberg
SINGER, our ARG inference method, is finally published and freely available online:

doi.org/10.1038/s415...

It was a long journey – 16 months from initial submission to acceptance. Is it just me, or has peer review gotten more arduous lately? 4+ rounds of review isn't so unusual these days...
Robust and accurate Bayesian inference of genome-wide genealogies for hundreds of genomes - Nature Genetics
SINGER is a method for creating ancestral recombination graphs to understand the genealogical history of genomes. The method has increased speed, and thus scalability, without sacrificing accuracy.
doi.org
September 11, 2025 at 3:50 AM
Reposted by Per Unneberg
De tre mest profilerade skolorna/förskolorna med den allt mer kritiserade engelska profileringen har alla tydliga kopplingar till regeringspartierna. Varför säger vi inte rätt ut att det här är stört?
September 3, 2025 at 6:21 PM
Reposted by Per Unneberg
Such an exciting diversity and quality of presentations related to the evolution of vision and opsins at #ESEB2025! I regret we did not organize an associated symposium on these topics. To make up for it, please pop by my poster today (035) and we can have a mini symposium right here!
August 18, 2025 at 11:01 AM
Want to know more about ecological adaption in krill? Come listen to me talk about population genomics of the Northern krill. Session Evolutionary genomics (S23.02). #eseb2025
August 18, 2025 at 6:37 AM
Reposted by Per Unneberg
1. "'Trusting the experts is not a feature of either a science or democracy," Kennedy said."

It's literally a vital feature of both science and of representative democracy.

I've written a fair bit about trust in expertise as a vital mechanism in the collective epistemology of science.
RFK Jr. in interview with Scripps News: ‘Trusting the experts is not science’
HHS Secretary RFK Jr. sat down with Scripps News for a wide-ranging interview, discussing mRNA vaccine funding policy changes and a recent shooting at the Centers for Disease Control and Prevention.
www.scrippsnews.com
August 12, 2025 at 4:48 AM
Reposted by Per Unneberg
🥼 In an escalating climate and nature emergency there are *so* many ways that scientists use our skills and influence positively.

Want to know more? Check out Charlie's thread, and our brand new paper: www.nature.com/articles/s44168-025-00268-9
July 31, 2025 at 6:00 PM
Reposted by Per Unneberg
Claim: "Water vapor is a greenhouse gas!"
Reality: Yes, and there's more of it in a warmer atmosphere

-"CO2 is plant food!"
-pretty hard to eat when you're on fire

-"Climate has changed before!"
-We know, we told you that

-"Scientists don't know everything!"
- doesn't mean we know *nothing*
July 30, 2025 at 3:17 PM
Reposted by Per Unneberg
🧵Introducing the Trump Action Tracker website!

Today I’m launching www.trumpactiontracker.info - a live, searchable list of authoritarian‑style actions from Trump’s second term (over 740 actions so far). 1/14
July 21, 2025 at 8:57 PM
Reposted by Per Unneberg
We see here a self-styled "honest broker" with decades of experience in downplaying climate change presenting an age-old climate denial trope: using *annual* rainfall data as argument against an increase in *extreme* rainfall.
Does he *really* not know better? Or assume his readers won't?
🧵1/5
July 12, 2025 at 2:59 PM
Reposted by Per Unneberg
“Only 2 of 225 US biology PhD programs assessed offer annual salaries meeting basic living wages”

Sad parallel with our findings in Canada, recently published in PLOS One (Fraass et al. 2025)
July 8, 2025 at 3:41 PM
Reposted by Per Unneberg
My latest for American Scientist Magazine helps give scientists the tools to fight back against politicized charges that our research is silly or pointless- tools that will work whether you’re asked “why are we funding this” from your asshole uncle at Thanksgiving or an asshole US Senator.
🧪🌎
“Why Are We Funding This?”
Long-standing myths about “silly science” have contributed to the reckless slashing of government-supported research.
www.americanscientist.org
June 17, 2025 at 9:47 PM
Reposted by Per Unneberg
For perspective: a recent study suggested that economic savings from just a *single* well-predicted hurricane, thanks to NOAA research advancements, are on order of *$5 billion.* That exceeds NOAA's *entire proposed annual operating budget.* So much for government efficiency.
July 1, 2025 at 5:18 PM
Reposted by Per Unneberg
After the latest round of grading papers, I wrote about AI, ChatGPT, the death of the student essay, and what it means for the future of human cognition.
The Death of the Student Essay—and the Future of Cognition
One professor's reflections on the end of an era, as AI tools such as ChatGPT have murdered the student essay (RIP). Here's why that threatens the future of human cognition—and how to save ourselves.
www.forkingpaths.co
June 19, 2025 at 10:44 AM
Reposted by Per Unneberg
Our new paper updating key metrics in the IPCC is now out, and the news is grim:

⬆️ Human induced warming now at 1.36C
⬆️ Rate of warming now 0.27C / decade
⬆️ Sharp increase in Earth's energy imbalance
⬇️ Remaining 1.5C carbon budget only 130 GtCO2

essd.copernicus.org/...
Indicators of Global Climate Change 2024: annual update of key indicators of the state of the climate system and human influence
Abstract. In a rapidly changing climate, evidence-based decision-making benefits from up-to-date and timely information. Here we compile monitoring datasets (published at https://doi.org/10.5281/zenodo.15639576; Smith et al., 2025a) to produce updated estimates for key indicators of the state of the climate system: net emissions of greenhouse gases and short-lived climate forcers, greenhouse gas concentrations, radiative forcing, the Earth's energy imbalance, surface temperature changes, warming attributed to human activities, the remaining carbon budget, and estimates of global temperature extremes. This year, we additionally include indicators for sea-level rise and land precipitation change. We follow methods as closely as possible to those used in the IPCC Sixth Assessment Report (AR6) Working Group One report. The indicators show that human activities are increasing the Earth's energy imbalance and driving faster sea-level rise compared to the AR6 assessment. For the 2015–2024 decade average, observed warming relative to 1850–1900 was 1.24 [1.11 to 1.35] °C, of which 1.22 [1.0 to 1.5] °C was human-induced. The 2024-observed best estimate of global surface temperature (1.52 °C) is well above the best estimate of human-caused warming (1.36 °C). However, the 2024 observed warming can still be regarded as a typical year, considering the human-induced warming level and the state of internal variability associated with the phase of El Niño and Atlantic variability. Human-induced warming has been increasing at a rate that is unprecedented in the instrumental record, reaching 0.27 [0.2–0.4] °C per decade over 2015–2024. This high rate of warming is caused by a combination of greenhouse gas emissions being at an all-time high of 53.6±5.2 Gt CO2e yr−1 over the last decade (2014–2023), as well as reductions in the strength of aerosol cooling. Despite this, there is evidence that the rate of increase in CO2 emissions over the last decade has slowed compared to the 2000s, and depending on societal choices, a continued series of these annual updates over the critical 2020s decade could track decreases or increases in the rate of the climatic changes presented here.
essd.copernicus.org
June 18, 2025 at 11:10 PM