this post was submitted on 06 Jul 2025
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Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.

As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades: Graph of temperature as observed with significant warming, and simulated without added greenhouse gases and other anthropogentic changes, which shows no significant warming

How much each change to the atmosphere has warmed the world: IPCC AR6 Figure 2 - Thee bar charts: first chart: how much each gas has warmed the world. About 1C of total warming. Second chart: about 1.5C of total warming from well-mixed greenhouse gases, offset by 0.4C of cooling from aerosols and negligible influence from changes to solar output, volcanoes, and internal variability. Third chart: about 1.25C of warming from CO2, 0.5C from methane, and a bunch more in small quantities from other gases. About 0.5C of cooling with large error bars from SO2.

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Major reversal in ocean circulation detected in the Southern Ocean, with key climate implications - Institut de Ciències del Mar (www.icm.csic.es)
submitted 3 days ago* (last edited 3 days ago) by [email protected] to c/[email protected]
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I just realized this has already been posted.

My mistake.

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[–] [email protected] 22 points 3 days ago (1 children)

That's bad

[–] [email protected] 11 points 3 days ago (1 children)

Yes. It seems to have turned a part of the ocean which acted as a carbon sink into a carbon source. They don't mention gigatonnes, but I would guess: a few (that's a lot).

[–] [email protected] 7 points 3 days ago (1 children)

I think it said atmospheric CO2 will double as a result

Lmao we're so fucked yall, I keep saying...

[–] [email protected] 11 points 3 days ago (1 children)

The image caption does say "could double", but the PNAS article doesn't mention that. As far as I understand, the role of the Southern Ocean as a whole as a carbon sink is big (two-digit percentage of human-caused emissions). But the effect subdivides into biological (phytoplankton) and physical (currents downwelling CO2-rich water and upwelling CO2-poor water). And I'm not aware or capable of pointing out a balance sheet of how much each component does.

[–] [email protected] 4 points 3 days ago

That's fair