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Helmi Räisänen @helmiraisanen.bsky.social · 1d

Nearly 40% of global transboundart river basins could face potential conflicts driven by water scarcity in 2041–2050, with hotspots in Africa, southern and central Asia, the Middle East, and North America
www.nature.com/articles/s41...

Transboundary conflict from surface water scarcity under climate change - Nature Communications

Transboundary river basins (TRBs) are at an increasing risk of water scarcity-induced conflicts. Nearly 40% of global TRBs could face such conflicts by 2050, but measures such as intra-basin cooperation could reduce this proportion to less than 10%.

www.nature.com

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Reposted by Helmi Räisänen

Dr. Crystal A. Kolden @pyrogeog.bsky.social · 5d

Published today: our new paper showing a 44-year trend of increasing global wildfire disasters (fatalities and economic losses) due to climate change-induced extreme weather. www.science.org/doi/10.1126/...

Climate-linked escalation of societally disastrous wildfires

Climate change and land mismanagement are creating increasingly fire-prone built and natural environments. However, despite worsening fire seasons, evidence is lacking globally for trends in socially ...

www.science.org

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Helmi Räisänen @helmiraisanen.bsky.social · 9d

Geologic CO₂ storage capacity is limited (1,460 Gt). Without steep near-term emission cuts, we risk exhausting capacity before 2200. Even at max use, storage only lowers warming by 0.7 °C—making it a finite, intergenerational resource for climate strategy. www.nature.com/articles/s41...

A prudent planetary limit for geologic carbon storage - Nature

A risk-based, spatially explicit analysis of carbon storage in sedimentary basins establishes a prudent planetary limit of around 1,460 Gt of geological carbon storage, which requires making explicit decisions on priorities for storage use.

www.nature.com

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Helmi Räisänen @helmiraisanen.bsky.social · 26d

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...

Future ocean warming may cause large reductions in Prochlorococcus biomass and productivity - Nature Microbiology

Decade-long field measurements and modelling show that projected ocean temperatures could restrict cell division rates of an important marine cyanobacterium.

www.nature.com

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 29

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/...

Collapse of critical Atlantic current is no longer low-likelihood, study finds

Scientists say ‘shocking’ discovery shows rapid cuts in carbon emissions are needed to avoid catastrophic fallout

www.theguardian.com

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Reposted by Helmi Räisänen

Hanna Nikkanen @hannanik.bsky.social · Aug 29

Yleisön ilmastonmuutoshuolen taso Euroopan maissa. Etelä-Eurooppa kärjessä, pohjoismaat häntäpäässä.

Silti Suomessakin elää yhä myytti siitä, että meillä ollaan ilmastotietoisia, muualla pöljäillään sokeasti menemään.

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Reposted by Helmi Räisänen

Leo Hickman @leohickman.carbonbrief.org · Aug 29

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

Ketan Joshi @ketanjoshi.co · Aug 28

Thank you @joshgabbatiss.bsky.social for the reminder that golf courses should be forcibly seized by the government and converted to solar farms

interactive.carbonbrief.org/factcheck/so...

Farimore space is taken up by golf courses than solar power in many countries
Ground area, km2, used for ground-mounted solar and golf courses in a selection of high-income countries
8,014
1,895.9
1,402
1,194
1,060
595.5
622
343.5
370.5
312
186
232.5
253
162
68.4
Source: Weinand et al (2025)
Carbon Brief

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Reposted by Helmi Räisänen

Dr. Genevieve Guenther (she/they) @doctorvive.bsky.social · Aug 28

"already outpacing efforts to adapt"

Prof Friederike Otto @frediotto.bsky.social · Aug 28

One of the strongest, clearest increases in likelihood & intensity, attributable to climate change, I've seen in a complex index like fire weather - the more intense & frequent events in Greece & Türkiye are already outpacing efforts to adapt.
www.worldweatherattribution.org/weather-cond...

map of the Aegean coast depicting change in vapour pressure deficit due to climate change

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 28

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...

Large reductions in tropical bird abundance attributable to heat extreme intensification - Nature Ecology & Evolution

Climate change poses a growing threat to biodiversity, but disentangling its overall impact from other anthropogenic stressors is challenging. Here the authors use a data-driven climate attribution fr...

www.nature.com

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 27

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

Repeated heatwaves can age you as much as smoking or drinking

Long-term study suggests that the more heatwaves people are exposed to, the more it accelerates body ageing.

www.nature.com

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 25

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...

Warming of +1.5 °C is too high for polar ice sheets - Communications Earth & Environment

Warming of +1.5 °C above pre-industrial levels is too high for the Greenland and Antarctic ice sheets, and even the current climate forcing of +1.2 °C is likely to lead to several meters of sea-level ...

www.nature.com

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Reposted by Helmi Räisänen

Jussi Tervola @jussitervola.bsky.social · Aug 25

Havaitsimme, että aiemmat arviot sosiaaliturvamuutosten yhteisvaikutuksista ovat liioitelleet toimeentulotuen suojaavaa vaikutusta.

Tarkennetulla mallilla toimeentulotuen saajamäärän lisäys on aiempia arvioita pienempi -> vaikutukset pienituloisuuteen ovat suurempia.

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THL:n tarkentama laskentamalli muuttaa kuvaa sosiaaliturvaleikkausten vaikutuksista

thl.fi

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Reposted by Helmi Räisänen

Garry Peterson @resiliencesci.bsky.social · Aug 22

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"

Evidence of abrupt change -> Top, multiple climate pressures, including extreme events, are increasing the risk of abrupt changes in the Antarctic environment. Middle, there are multiple processes through which Antarctic ice, ocean and biological systems are connected to each other and feedback onto global climate drivers; most involve amplifying changes (black text and arrows), some inhibit change (grey text and arrows), whereas in some cases the dominant process connecting different elements is not yet clear (dashed arrows). Base images used to represent each Antarctic system are derived from Figs. 1 and 3–5. Bottom, policy responses to avoid abrupt Antarctic changes depend on rapid and deep CO2 emission reductions, while other actions may aid adaptation and resilience to abrupt change in the Antarctic environment.

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 22

yle.fi/a/74-20178686

Järjestö: UPM keitti harvinaisesta luonnonmetsästä sellua – jäi kiinni, kun aktivistit seurasivat puukuormaa

Greenpeace ja Metsäliike käyttivät teknistä paikannusta puukuormien paikannuksessa. Yle on nähnyt paikannustiedot ja varmistanut, minne puu on mennyt.

yle.fi

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Reposted by Helmi Räisänen

Leon Simons @leonsimons.bsky.social · Aug 20

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.

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 21

@atteharjanne.vihreat.fi Sua vois kiinnostaa tää!

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 15

@ezhakala.bsky.social @ahokasjaj.bsky.social @jussiteronen.bsky.social @tttoivanen.bsky.social @terevaden.net @roopekaaronen.net @tamparvi.bsky.social @mamanninen.bsky.social

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 15

What are the ecological costs of derisking, or, on the other hand, outsourcing environmental impacts to third countries? Can self-sufficiency align with planetary boundaries?

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 15

Questions remain: What exactly are the material needs for the energy transition? How can raw material demands across sectors and countries be balanced to enable the transition?

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 15

Yet majority of our interviewees were concerned about the timely availability of raw materials for the energy transition and about the impacts of geopolitical competition on the transition.

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 15

Despite the drive for material self-sufficiency, radical departures from the status quo of “market-liberal orientation” to strategic autonomy are avoided.

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 15

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.

Supply chain imaginaries of the green transition: Resource governance in the Finnish battery cluster

The significance of several resource-intensive supply chains has been highlighted as societies around the world seek to decarbonize their emissions-in…

www.sciencedirect.com

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Helmi Räisänen @helmiraisanen.bsky.social · Aug 11

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/...

Darkening of the Global Ocean

The ocean is darkening, with less sunlight reaching deeper waters over the past 20 years. Analysing satellite data, we found that 21% of the global ocean has experienced reduced light penetration, wi...

onlinelibrary.wiley.com

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Reposted by Helmi Räisänen

Jussi T. Eronen @jussiteronen.bsky.social · Jul 4

Jahas.

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

Nimitykset | Metsäteollisuuden päälobbari siirtyy päättämään valtion metsien hakkuista

Metsäteollisuus ry:n metsäjohtaja Karoliina Niemi on nimitetty Metsähallituksen Metsätalous Oy:n toimitusjohtajaksi.

www.hs.fi

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Reposted by Helmi Räisänen

Aatu Puhakka @aatupuhakka.bsky.social · Jul 3

Helsingin Sanomat julkaisi mielipidekirjoitukseni tieteen rahoituksesta

Lukijan mielipide | Tieteen tarkoitus ei ole miellyttää ulkopuolisia tahoja
www.hs.fi/mielipide/ar...

Lukijan mielipide | Tieteen tarkoitus ei ole miellyttää ulkopuolisia tahoja

Vaatimus siitä, että tieteen pitäisi perustella tärkeytensä jollekin ulkopuoliselle taholle, ei kannusta riippumattomuuteen.

www.hs.fi

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