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Tanja Schlemm (she/her)

@tschlemm

I do numerical modelling of ice sheets, iceberg calving and sea ice melange at PIK, exploring their role in climate change and our planet’s future.

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Latest posts by Tanja Schlemm (she/her) @tschlemm

What I gather from this ancient Babylonian dialogue (and others) is that we have grappled with injustice for millennia. We've talked about it with our friends, and we've felt understandably depressed. How can we not?

But we will keep fighting, and the smoke will clear one day...

10.03.2026 10:49 👍 441 🔁 40 💬 10 📌 0

How much more evidence do we need? The ultra-rich and the governments supporting them will destroy everything for the sake of profit, power and pride. Nothing is precious to them - not human life, not the living world - except their own wealth and status. Our survival depends on resisting them.

10.03.2026 07:26 👍 7795 🔁 2633 💬 234 📌 144
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UK must stockpile food in readiness for climate shocks or war, expert warns Prof Tim Lang says country produces far less food than it needs to feed population and is particularly vulnerable

I can sort of understand people treating climate breakdown as a distant, peripheral issue when they thought it was just a future threat to polar bears and Pacific Islands

But we're seeing these sorts of warnings all the time now, and little seems to have changed

07.03.2026 11:06 👍 101 🔁 49 💬 11 📌 4
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Sea level much higher than assumed in most coastal hazard assessments - Nature Meta-analyses on a global scale show that the measured coastal mean sea level is higher than assumed in most coastal hazard assessments.

I’m grumpy about this paper, which has been poorly communicated in a way that’s taken up a bunch of my time this week and is the result of framing decisions in the paper itself.

08.03.2026 19:14 👍 20 🔁 11 💬 1 📌 1
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Budget cuts at Environment and Climate Change Canada threaten Arctic science For decades, ECCC research scientists have been integral to the work of the Arctic Monitoring and Assessment Programme.

Another blow to climate science: budget cuts at Environment and Climate Change Canada threaten long-running Arctic monitoring programs, some with >50-year datasets.

The Arctic is warming ~4× faster than the global average. Cutting the science that tracks is…

theconversation.com/budget-cuts-...

08.03.2026 19:29 👍 130 🔁 70 💬 5 📌 6
Chart showing the exponential collapse of the lag, extrapolated to 2.0C. Reference points show 10, 20 and 30 year lag scenarios projecting 2033, 2043 and 2053 respectively.

Chart showing the exponential collapse of the lag, extrapolated to 2.0C. Reference points show 10, 20 and 30 year lag scenarios projecting 2033, 2043 and 2053 respectively.

1/🌡️ Global warming passed a milestone on 17th Nov 2023 that barely made the news

For the first time ever, the world's daily average temperature was 2.0°C above pre-industrial levels

Here's what the data says about when that becomes the annual norm, & whether it's coming sooner than anyone expects🧵

08.03.2026 10:05 👍 124 🔁 103 💬 5 📌 6
Ki-generierte Version

Ki-generierte Version

Originalbild mit dem die KI gefüttert wurde

Originalbild mit dem die KI gefüttert wurde

Die Forschungsministerin freut sich auf Insta darüber, dass jetzt "Porträts" von Frauen der Geschichte in ihrem Haus hängen. Nur: Die sind mit KI erstellt. Und schleifen die Gesichter der Frauen gemäß moderner westlicher Schönheitsideale glatt.
Was für ein irres Projekt
Z.B.

07.03.2026 06:31 👍 2406 🔁 865 💬 101 📌 106
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Three days of Operation Epic Fury: rapid overview of environmental harm in Iran and the region - CEOBS Rapid overview of emerging environmental issues and risks in Iran and the wider region from Operation Epic Fury.

Overview of emerging environmental issues and risks in #Iran and the wider region from Operation #EpicFury. We're already seeing pollution incidents that are placing people and ecosystems at risk of acute and chronic harm: ceobs.org/three-days-o... #IsraelIranWar 1/5

03.03.2026 14:27 👍 9 🔁 15 💬 1 📌 1
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New from Picketty's lab: The world can raise incomes toward global equity & stabilize the climate under "under very strict conditions"

—reduction of work hours
—consumption shift toward immaterial sectors
—major change in food habits
—a fast energy transition requiring massive low-carbon investment

03.03.2026 17:29 👍 122 🔁 49 💬 4 📌 9
Post image Post image Post image Post image

In Berlin haben wir spontan mit hunderten Leuten vor dem Kanzleramt klargemacht: Wir lassen diesen Angriff auf Energiewende und Klimaziele nicht zu! Erneuerbare sind die Zukunft ☀️

03.03.2026 18:47 👍 500 🔁 149 💬 18 📌 3
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Early-career scientists: Applications are open to join the group review of the IPCC AR7 Working Group First Order Draft.
Apply by 23 March 2026 (23:59 UTC-12): forms.gle/wkaJVjMKfT3w... Onboarding & training: April - June 2026 Review: 10 Aug - 2 Oct 2026 More info here www.apecs.is/news/apecs-n...

02.03.2026 13:26 👍 5 🔁 3 💬 1 📌 1
Turquoise icebergs seen from above, with a huge amount visible under the water - far larger than the bits visible above the water. There are also some bits of flat ice at the top right that look a little pink in the setting sunlight.

Turquoise icebergs seen from above, with a huge amount visible under the water - far larger than the bits visible above the water. There are also some bits of flat ice at the top right that look a little pink in the setting sunlight.

More ridiculously turquoise icebergs in Jökulsárlón glacial lagoon a couple of nights ago.

#Iceland #DronePhotography #DJIMavic3Pro

02.03.2026 14:13 👍 122 🔁 14 💬 0 📌 0

I feel like the world is moving too fast right now, and I worry about all of the people who need help and attention around the world and are being made invisible in the international news because of all the war-loving crazies. Not to mention the ecosystems.

02.03.2026 15:32 👍 32 🔁 10 💬 3 📌 0

As a glaciologist, it is strange to realize that I can't go back to visit many of my past field sites, the memories are there, the ice is gone or soon to be gone. #ThwaitesGlacier #climategrief #glaciers #Antarctica

02.03.2026 16:49 👍 6 🔁 2 💬 0 📌 0
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Thwaites Eastern Ice Shelf heading for collapse. Monthly average velocities Jan 2025 to Feb 2026 derived from EU Copernicus Programme Sentinel-1 SAR data. Grounding lines in black and yellow from NASA MEaSUREs

02.03.2026 16:06 👍 15 🔁 6 💬 4 📌 2

Excellent article by @bobkopp.net describing the attacks on climate science by the Trump administration and calling for the research community to find a better strategy to respond. Articles like this are a critical to letting people know the full scope of what's being done to science.

02.03.2026 17:59 👍 10 🔁 6 💬 0 📌 0
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Ocean heat forced West Antarctic Ice Sheet retreat after the Last Glacial Maximum - Nature Communications Amundsen Sea records show warm Circumpolar Deep Water drove major West Antarctic Ice Sheet retreat from 18,000–10,000 years ago. Subsequent cooling stabilized the grounding line, indicating ocean heat...

🧪🌊🧵 Great to see this published. An 18,000 year record of deep water temperatures on the Amundsen Sea continental shelf, which confirms that incursion of warm water onto the shelf has been the main driver of West Antarctic Ice Sheet retreat throughout deglaciation.

www.nature.com/articles/s41...

02.03.2026 23:24 👍 31 🔁 13 💬 1 📌 0
A lone gentoo penguin on the rocky shoreline.

A lone gentoo penguin on the rocky shoreline.

An Antarctic shag perched on a rock with icebergs in Paradise Harbour in the background.

An Antarctic shag perched on a rock with icebergs in Paradise Harbour in the background.

A leopard seal resting on ice in Paradise Harbour.

A leopard seal resting on ice in Paradise Harbour.

Two gentoo penguins on the beach at Stony Point, seemingly trying to decide what to do about the Weddell seal that is in their way (front centre of photo)

Two gentoo penguins on the beach at Stony Point, seemingly trying to decide what to do about the Weddell seal that is in their way (front centre of photo)

Day 9 of my voyage to the #Antarctic Peninsula on the #tallship #BarkEuropa (continued): a selection of wildlife photos taken at Stony Point.
#BusmansHoliday

25.02.2026 23:01 👍 10 🔁 2 💬 1 📌 0
Marlena's PhD story
Marlena's PhD story YouTube video by Centre for Polar Observation and Modelling (CPOM)

What can a PhD in polar science look like? 🧊

We followed CPOM PhD researcher Marlena Holloway (@northumbriauni.bsky.social) during the first year of her PhD to find out 👇

youtu.be/m5d7wYl5hRo

25.02.2026 13:06 👍 5 🔁 2 💬 0 📌 0
This is figure 1, which shows a risk map of Antarctic ice catchment basins.

This is figure 1, which shows a risk map of Antarctic ice catchment basins.

The results of a study in Nature Climate Change imply that the Antarctic Ice Sheet does not act as one single tipping element, but rather as several tipping systems interacting across drainage basins. go.nature.com/4rFXQ9q 🧪

25.02.2026 14:35 👍 44 🔁 18 💬 0 📌 1

But we got a very specific example of that recently, and specifically using Claude Code - the software cited in Zeke's post.

You can immediately see why corporations like Anthropic *refuse* to disclose absolute, total numbers for energy consumption, and stick with per-query numbers

24.02.2026 20:13 👍 19 🔁 5 💬 4 📌 0
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OKAY BIG ONE FOR YA

NEW report out today: I dig deep into how big tech has been muddling tech types and overstating evidence to claim "AI" will make global emissions drop like a stone....

Not only will it not, it seems to be verifiably doing the opposite!!

ketanjoshi.co/2026/02/17/b... + 📼+🧵>

17.02.2026 06:48 👍 660 🔁 325 💬 17 📌 31
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#RECCAP2 paper alert, Jemma Wadham led the polar chapter, summarizing knowns and (large) unknowns of carbon stocks and fluxes from ice sheets to land fringes, fjords, 🌊 oceans and sediments.🧪 Excellent reference starting point for future work.
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
@awi.de

22.02.2026 12:21 👍 18 🔁 9 💬 0 📌 1
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East Antarctica has been the epicenter for unusually persistent blocking and atmospheric river landfalls that have resulted in some extreme high temperatures. From February 12-March 1, I've noted 5 distinct atmospheric river events observed/forecasted over Wilkes Land.

23.02.2026 09:38 👍 6 🔁 5 💬 1 📌 1

🇦🇶 Reminder: Share Your Views on Antarctica & the Southern Ocean! 🇦🇶

SCAR is updating its Antarctic and Southern Ocean Horizon Scan and wants to hear from you.

🔷 Submit your response by 1 March 2026: bit.ly/scar-horizon...

23.02.2026 14:19 👍 1 🔁 2 💬 0 📌 0

The fundamental premise behind AI-enabled cheating is that coursework is merely busy work, because your'e just doing it for professors.

We would never say that showing up for football practice is merely busy work because you're just doing it for your coaches.

23.02.2026 15:51 👍 160 🔁 56 💬 5 📌 5

This!👇
Armed conflict exacerbates climate change
Russia’s full-scale invasion of Ukraine drove greenhouse gas emissions (GHG) up by 75M tonnes CO2 equivalents -
comparable to the annual emissions of France

What happens in a war zones affects the entire globe as well as the local communities 😡🌍

23.02.2026 20:44 👍 18 🔁 11 💬 1 📌 1
A pointy brown mountain with a glacier in front of it and some turquoise icebergs in the lagoon in front of it - they almost look like whales at the surface. The sky above is bright blue.

A pointy brown mountain with a glacier in front of it and some turquoise icebergs in the lagoon in front of it - they almost look like whales at the surface. The sky above is bright blue.

Turquoise iceberg close-up - lots of bubbles and round shapes. There are some tiny areas that look a little pink/red at the top.

Turquoise iceberg close-up - lots of bubbles and round shapes. There are some tiny areas that look a little pink/red at the top.

Blue iceberg layers, seen on a glacier. There are some patches of snow.

Blue iceberg layers, seen on a glacier. There are some patches of snow.

A green/turquoise glacier face with some smooth bits at the foot (with some snow on them) and some jagged bits in the sun behind, with the glacier in shadow behind coming down the hill side.

A green/turquoise glacier face with some smooth bits at the foot (with some snow on them) and some jagged bits in the sun behind, with the glacier in shadow behind coming down the hill side.

Haven't posted much colour recently, so here's some varying turquoise ice from Feb 2020.

#Iceland #AwesomeFoursome

23.02.2026 22:46 👍 164 🔁 19 💬 4 📌 0
Line graph time series of 2026's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2025. 2026 is shown with a thick gold line. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between January and March by looking at the decadal average line positions.

Line graph time series of 2026's daily Arctic sea ice extent compared to decadal averages from the 1980s to the 2010s. The decadal averages are shown with different colored lines with purple for the 1980s, blue for the 1990s, green for the 2000s, and white for the 2010s. Thin white lines are also shown for each year from 2000 to 2025. 2026 is shown with a thick gold line. There is a long-term decreasing trend in ice extent for every day of the year shown on this graph between January and March by looking at the decadal average line positions.

Monday ice update - #Arctic sea ice extent is currently the 2nd lowest on record (JAXA data)

• about 410,000 km² below the 2010s mean
• about 1,000,000 km² below the 2000s mean
• about 1,510,000 km² below the 1990s mean
• about 1,970,000 km² below the 1980s mean

More: zacklabe.com/arctic-sea-i...

23.02.2026 16:40 👍 77 🔁 36 💬 2 📌 4

In a new review led by Prof @iceybethan.bsky.social we outline three possible futures for the Antarctic Peninsula.

The bottom line? Decisions we make in this decade will shape the region’s climate trajectory for decades and centuries to come. 🇦🇶❄️🧪

@cires.colorado.edu @colorado.edu

20.02.2026 15:54 👍 11 🔁 6 💬 0 📌 0