this post was submitted on 17 Dec 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.

Recommended actions to cut greenhouse gas emissions in the near future:

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If we want to use Direct Air Captur to limit overall warming to 1.5°C, while emitting enough to reach 2.5°C, DAC would need to use something like 30% of all electricity consumed over the next 80 years (slrpnk.net)
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[–] phoenixz@lemmy.ca 4 points 6 days ago

Yep, only probably more than 30. Also, only when all our power generation has gone CO2 free, so all renewable and nuclear or (one day, one day) fusion.

Until then it's just a waste of power as the power to pull the CO2 out of the air generates more CO2 than you're capturing. If you have partial renewable, like now, routing renewable power to capturing CO2 is less efficient then just routing that renewable power to other places because those other places still will be generating more CO2 than you're capturing.

So until the entire world (except maybe airplanes) is on renewable electricity, don't even bother unless it's for research and making better CO2 capture