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Helmi Räisänen

@helmiraisanen.bsky.social

Postdoctoral Fellow @FIIA; Visiting Researcher @Uni Helsinki | A professional pessimist into crisis management; environmental security; critical minerals, fertiliser, and pharmaceutical supply chains; pandemic preparedness; AMOC collapse

76 Posts611 Follower1061 Folgt
Prof Ian Hall@ianhall.bsky.social · 4w ago

A striking climate-model result suggests AMOC may have a rate-induced tipping point. 👉 Slow CO₂ increase: AMOC stable to +5.5°C 👉 Faster increase: collapse around +2°C Same climate system. Very different outcome. The rate of warming matters. www.nature.com/articles/s41...

Failure to track a stable AMOC state under rapid climate change - Nature Climate Change

Climate change is expected to alter oceanic circulation, with the Atlantic Meridional Overturning Circulation (AMOC) at risk of collapse. This work shows that the stability of the AMOC is dependent on...

nature.com

Ville Niinistö@villeniinisto.vihreat.fi · 3mo ago

Asiantuntijaraportti varoittaa eurooppalaisten yhteiskuntien häiriönsietokyvyn ja ruokaturvan vaarantumisesta, ellei Euroopan unioni onnistu pysäyttämään ja kääntämään luonnonvaraisten pölyttäjien katoa ja tukemaan tarhattujen mehiläisten elinolosuhteita. www.uef.fi/fi/artikkeli...

Kansainvälinen asiantuntijaraportti varoittaa Eurooppaa uhkaavasta kriisistä, ellei pölyttäjäkatoa onnistuta pysäyttämään

Tuoreessa tiekartassa esitetään keinoja luonnonvaraisten pölyttäjäkantojen elvyttämiseksi ja tarhattujen mehiläisten suojelemiseksi.

uef.fi

Katharine Hayhoe@katharinehayhoe.com · 3mo ago

This discussion puts its finger squarely on one of the two thorniest issues of geoengineering - namely that, to succeed, it would require multidecadal stable and rational governance of the countries and entities involved. How's that going, these days?

Michael E. Mann@michaelemann.bsky.social · 3mo ago

"Termination Shock — The Existential Danger Of Geoengineering" by Steve Hanley for @cleantechnica.bsky.social: cleantechnica.com/2026/06/21/t...

Helmi Räisänen@helmiraisanen.bsky.social · 3mo ago

We can't decarbonize our way out of resource overuse through cleaner production/technological fixes alone. Demand reduction is essential: material efficiency, sufficiency and societal participation can deliver substantial emissions cuts within realistic resource limits.

Demand-side innovation is the priority for decarbonizing materials - Nature Reviews Materials

Global industrial emissions from bulk materials continue to rise despite climate policies. This Perspective uses an illustrative resource-constrained model of a national transition to net zero to show...

nature.com

Helmi Räisänen@helmiraisanen.bsky.social · 3mo ago

Heard of "multiple breadbasket failures" - simultaneous crop failures across major agricultural regions? A recent paper shows that unprecedented global droughts don't require record-breaking droughts everywhere. Systemic risk can emerge from combinations of moderate shocks.

Global record-shattering breadbasket droughts emerge from moderately extreme regional events - Nature Communications

The study shows that global record shattering droughts across major maize producing regions become more likely this century and typically arising from concurrent moderately extreme droughts rather tha...

nature.com

Helmi Räisänen@helmiraisanen.bsky.social · 3mo ago

Saatiin Ilmatieteen laitoksen johdolla lisää rahaa AMOCin tutkimiseen! 🌊 The Government is funding our research project on the AMOC, led by the Finnish Meteorological Institute! valtioneuvosto.fi/-/1410903/su...

Suomi varautuu Atlantin valtameren kiertoliikkeen (AMOC) heikkenemiseen – uusi tutkimushanke käynnistyy

Ilmatieteen laitoksen vetämä tutkimus tuottaa ensimmäistä kertaa kuvauksen Atlantin valtameren kiertoliikkeen (AMOC) heikkenemisen vaikutuksista Suomeen. Valtioneuvoston rahoittama HIIPUVA-hanke vahvi...

valtioneuvosto.fi

Helmi Räisänen@helmiraisanen.bsky.social · 6mo ago

It’s not the average outcome of global warming we should fear. It’s the extremes already possible under “moderate” warming. New study: even ~2 °C warming can produce climate impacts as severe as average projections at 3–4 °C. www.nature.com/articles/s41...

Moderate global warming does not rule out extreme global climate outcomes - Nature

Extreme global climate outcomes may occur even under moderate 2 °C warming and may turn out to be more extreme than model-averaged projections at 3 °C or 4 °C warming.

nature.com

Lauri Myllyvirta@laurimyllyvirta.bsky.social · 6mo ago

It's crazy how reliant the world's entire energy system is on one body of water, the Strait of Hormuz, just 20 nautical miles across at its narrowest, and situated in one of the most volatile regions on Earth. Here are the countries most dependent on oil&gas through the strait.

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@ymparistotiedonfoorumi.fi · 6mo ago

Ohjelma on nyt julkaistu! 2026 YHYS Politiikkadialogi Datatalouden materiaalinen kestävyys pureutuu datatalouden materiaalisiin reunaehdoihin. 📅 23.4.2026, klo 9-12 📍 Marsio Living Room, Aalto-yliopisto + striimi Lisätietoja ja ilmoittautuminen: www.ymparistotiedonfoorumi.fi/yhys-politii...

YHYS Politiikkadialogi: Datatalouden materiaalinen kestävyys - Ympäristötiedon foorumi

Datataloutta kuvataan usein kevyenä ja aineettomana kasvun moottorina. Vuoden 2026 Politiikkadialogi kääntää katseen sen materiaaliseen todellisuuteen: energiaan, luonnonvaroihin ja ihmistyöhön, jotka...

ymparistotiedonfoorumi.fi

Tere Vadén@terevaden.net · 6mo ago

Oisko liikaa vaadittu, että jos haluaa syödä eläimiä, niin maksaisi niistä sitten täyden hinnan? Ilman niiden kuuluisien veronmaksajien tukia.

Eläinoikeuspuolue @eop.bsky.social · 6mo ago

Uusi selvitys paljastaa räikeän epäkohdan EU:n maataloustuissa: lihantuotanto saa jopa 580 kertaa enemmän tukia kuin palkokasvituotanto. Samaan aikaan lukuisat tutkijat kehottavat siirtymään kasvipohjaisempaan ruokavalioon terveyden, ilmaston ja eläinten vuoksi. www.theguardian.com/environment/...

Damian Carrington@dpcarrington.bsky.social · 7mo ago

Fundamentally flawed economic models mean #climatecrisis could crash global economy, experts warn - Shocks from extreme weather disasters and tipping points are entirely missed by the current models used by governments and financial institutions Story by me www.theguardian.com/environment/...

Flawed economic models mean climate crisis could crash global economy, experts warn

States and financial bodies using modelling that ignores shocks from extreme weather and climate tipping points

theguardian.com

Helmi Räisänen@helmiraisanen.bsky.social · 7mo ago

'Beneath the country’s political and economic crisis lies a more destabilising force that is still largely missing from international analysis: environmental breakdown. ... Protests increasingly erupt in areas where there is groundwater collapse, land subsidence and water rationing.'

Iran’s biggest centres of protest are also experiencing extreme pollution and water shortages

Shortages of water and power as well as rising air pollution in Iran are at the centre of why citizens are telling their government they want change.

theconversation.com

Lauri Myllyvirta@laurimyllyvirta.bsky.social · 8mo ago

New from us: EU CO2 emissions fell only 0.8% in 2025, the second year in a row that the bloc has fallen short of its targets. Adverse weather played a big role but underlying issues are slow progress on transport and buildings electrification and wind power buildout.

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Helmi Räisänen@helmiraisanen.bsky.social · 8mo ago

"For much of the world, ‘normal’ is gone" – Humans are "withdrawing and polluting water beyond renewable inflows and safe depletion limits" and causing irreversible damage to wetlands and lakes that could have helped with restoration. news.un.org/en/story/202...

World enters era of ‘global water bankruptcy’

The world has moved beyond a water crisis and into a state of global water bankruptcy, says a new flagship report released on Tuesday by UN researchers.

news.un.org