New study finds that warmer oceans could cut populations of Prochlorococcus — the tiny phytoplankton that produce ~20% of Earth’s oxygen and form the base of many marine food webs — by up to 50% in tropical seas by 2100 if surface waters keep rising above ~28 °C. www.nature.com/articles/s41...

Reading this makes me physically nauseous: Collapse of the AMOC is no longer a “low-likelihood” event - the tipping point that makes an Amoc shutdown inevitable is likely to be passed within a few decades www.theguardian.com/environment/...

Yleisön ilmastonmuutoshuolen taso Euroopan maissa. Etelä-Eurooppa kärjessä, pohjoismaat häntäpäässä. Silti Suomessakin elää yhä myytti siitä, että meillä ollaan ilmastotietoisia, muualla pöljäillään sokeasti menemään.

Golf courses are quite the comparative metric, on several levels...

"already outpacing efforts to adapt"

New research shows climate change has already reshaped biodiversity: tropical bird populations declined by 25–38% (1950–2020) due to heat extremes. Even in ‘undisturbed’ habitats, human-driven warming is driving losses www.nature.com/articles/s41...

Niille, joiden mielestä helleaallot on kivoja: Repeated heatwaves can age you as much as smoking or drinking www.nature.com/articles/d41...

Hey, have you remembered to think about multi-metre sea level rise today? "+1.5 °C is too high and that even current climate forcing (+1.2 °C), if sustained, is likely to generate several metres of sea-level rise over the coming centuries" www.nature.com/articles/s43...

Havaitsimme, että aiemmat arviot sosiaaliturvamuutosten yhteisvaikutuksista ovat liioitelleet toimeentulotuen suojaavaa vaikutusta. Tarkennetulla mallilla toimeentulotuen saajamäärän lisäys on aiempia arvioita pienempi -> vaikutukset pienituloisuuteen ovat suurempia. 1/

Emerging evidence of abrupt changes in the Antarctic environment Abram+ doi.org/10.1038/s415... "The only assured way of reducing the risk of abrupt changes in the Antarctic environment is to make rapid and deep CO2 emission reductions this decade"

This SINGLE WEEK of Spanish wildfire emissions surpassed ANNUAL total carbon emissions of each of the 100 lowest emitting countries in the world‼️ Carbon sinks are turning into sources We can’t expect nature to clean up our mess.

Our new study examines Finland’s green transition & critical raw material governance via socio-technical imaginaries. National economic gains are prioritised, planetary boundaries ignored–continuing Finland’s long history of heavy resource use despite its ‘sustainability leader’ image.

The global ocean is getting darker—threatening one of the most productive habitats on the planet. "The implications of ocean darkening for marine ecology and the ecosystem services provided by the surface oceans are currently unknown but likely to be severe." onlinelibrary.wiley.com/doi/10.1111/...

Jahas. www.hs.fi/politiikka/a...

Helsingin Sanomat julkaisi mielipidekirjoitukseni tieteen rahoituksesta Lukijan mielipide | Tieteen tarkoitus ei ole miellyttää ulkopuolisia tahoja www.hs.fi/mielipide/ar...

Essence of BBB:"dramatic cuts to environmental protections and regulations, kickbacks to the wealthy elite, a retreat from global climate commitments, and an expansion in fossil fuel extraction on public lands that will be underway for years to come. Climate and environmental consequences be damned"

Scientists have known for decades that soaring atmospheric CO2 emissions are causing changes in ocean chemistry, threatening marine life & ecosystems. In June 2025, a study found that ocean acidification has now passed a safe threshold across large swathes of the world’s marine environment.

I am more and more impressed every day by humanity's ability to ignore existential threats. "Antarctica has 80 metres of potential sea-level rise. We don’t expect all of that, but it is harder to know exactly what is happening." www.theguardian.com/environment/...

'Average global yields of six staple crops could fall by more than 11% under a moderate warming scenario by the end of the century – even when accounting for how farmers could adapt to climate change' www.carbonbrief.org/staple-crops...

www.nature.com/articles/d44... Future climate-driven monsoon variability could disrupt marine ecosystems and food security for millions; “We now see falls of up to 30% in chlorophyll levels — the plankton equivalent of a crop yield — in years with heavy monsoon rainfall”

www.carbonbrief.org/global-wheat... “The overall picture of the past half-century is that climate trends have led to a deterioration of growing conditions for many of the main grain-producing regions of the world.”

Mittaukset vahvistavat: avohakkuu kasvattaa ojitettujen turvemetsien kasvihuonekaasupäästöjä lyhyellä aikavälillä merkittävästi. www.luke.fi/fi/uutiset/m...

ping @helmiraisanen.bsky.social

uh oh what’s the fifth panel gonna be

"In a 3C scenario, all of the 30 crops studied would have their suitable cropland area reduced." www.carbonbrief.org/half-of-glob...

February 2025 #C3S Climate Bulletin: Third warmest February globally. Global average temperature was 0.63°C above 1991-2020 average. 1.59°C above pre-industrial levels highlights persistent warming trends. Full Climate Bulletin: climate.copernicus.eu/surface-air-...

NEW: The EU Commission will propose a weakening of the 2025 car CO2 target. If implemented, it would delay the scale up of EV production in Europe and remove pressure on the industry to roll out cheaper EV models this year. Read our reaction ➡️ bit.ly/3QFGgkS

I had my suspicions...but this is even worse than I imagined: "The “top five” journals of economics have only published 25 articles on climate change from 1975-Fall 2023."

Daily Briefing | Climate scientists sound alarm on US absence at key UN meetings ➡️ Read today's full briefing here: buff.ly/S0uoKrs ➡️ Sign up to our email briefings: buff.ly/3X60aJw

There is a new study out in Nature about the Atlantic overturning circulation. I will be curious to see the media reporting on this. If you wonder why, read my blog article on it! 🌊 www.realclimate.org/index.php/ar...

Siis mikä voisi mennä pieleen...? Lisätään dramaattisesti energiankulutusta samalla kun pitäis tehdä globaalisti energiasiirtymä, jonka teknologioihin on jo nyt vaikea saada tarpeeksi raaka-aineita yle.fi/a/74-20143439

Taalas: "Jos kerran luonnon mekanismit alkavat tuottaa hiilen vapautumista ilmakehään, onko se EU:n jäsenmaiden vika vai onko se luonnon prosessi?" Juuh kyllä, on vika, koska on laitettu prosessi käyntiin. Kutsutaan nimellä "ilmastonmuutos", johtuu fossiilipäästöistä. www.is.fi/taloussanoma...

Climate change target of 2C is ‘dead’, says renowned climate scientist Prof James Hansen says pace of global heating has been significantly underestimated, though other scientists disagree. www.theguardian.com/environment/...

www.hs.fi/mielipide/ar... "Lähes puolet maailman väestöstä elää maissa, joissa tieteen vapautta ei käytännössä ole."

Amid everything, a new study finds that microplastics are accumulating in human brains. “Every time we scratch the surface, it uncovers a whole host of, ‘Oh, is this worse than we thought?’” lead author Matthew Campen told me last fall. A short thread: 1/ www.washingtonpost.com/climate-envi...

What Trump declared is not an "energy emergency": in truly Orwellian fashion, he's excluded wind and solar from the definition of energy. It's a "fossil fuel emergency": the U.S. isn't producing and consuming enough dirty, inefficient and outdated fossil energy, according to Trump.

The people at CBECI were kind enough to send me a copy of their updated Bitcoin power consumption data At the end of 2024, Bitcoin's total consumption for 2024 *did* end up matching that of Pakistan. 2024 saw the biggest jump in power consumption ever. Absolutely wild stuff -> ccaf.io/cbnsi/cbeci

"Multi-year droughts have increased in size, temperature, dryness and duration. The global land area affected by this kind of drought increased at a rate of 49,279km2 per year during that time – equivalent to a size larger than Switzerland per year." www.carbonbrief.org/multi-year-d...

"Compared with ten months ago, the virus now has “a tonne more opportunities” to adapt to its new mammalian hosts because it has infected so many cows and other animals across the United States" www.nature.com/articles/d41...

This has to be one of the biggest fears. The optimistic case has always been clean tech will eventually (perhaps too late, but eventually) leave fossil fuels stranded. But what if fossil fuels can rely on illiberal governments that even as they start to become stranded guarantee them a market?

Mihins sitä tieteellistä tietoa nyt muka tarttis... www.hs.fi/politiikka/a...

I found the theme music of our era! 💥 3TEETH - Slum Planet Taste the waste of our neon disgrace Deformed children made from corporate god's grace Better wear a mask 'cause the air melts your face No one wins in this human race

Piti koittaa ja tosiaan: Instagram blokkaa haun häsällä #democrat mutta ei häsällä #republican.

Pitkä ja perusteellinen #metsä -juttu, montä hyvää haastateltavaa: www.ku.fi/artikkeli/51...

Maailman miljardöörien yhteenlaskettu omaisuus kasvoi viime vuona 2 triljoonalla dollarilla, 3 kertaa nopeammin kuin vuonna 2023. Köyhyysrajan alapuolella elävien osuus maailman väestöstä, 44%, ei ole muuttunut vuoden 1990 jälkeen. www.theguardian.com/news/2025/ja...

Oi jospa kaikki ympäristön likaaminen ja saastuttaminen tutkittaisiin yhtä tarkasti, vahinkojen suuruus arvioitaisiin ja syyylliset pantaisiin maksamaan… www.hs.fi/helsinki/art...