this post was submitted on 05 Jun 2024
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Climate - truthful information about climate, related activism and politics.

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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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Tracking the unprecedented impact of humans on the climate | Our new scientific assessment of how humans are affecting the climate is nothing short of alarming, yet contains some encouraging news (www.carbonbrief.org)
submitted 1 year ago by silence7@slrpnk.net to c/climate@slrpnk.net
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[–] benjhm@sopuli.xyz 3 points 1 year ago* (last edited 1 year ago)

The key new info is not the decadal trend, it's 'not yet risen beyond pre-pandemic levels' - in other words global emissions are ± flat. More recent info (also from carbonbrief) suggests that China's emissions may now be falling (and therefore likely global too -as China was such a large fraction of recent growth). On the other hand feedbacks from high temperatures in 2023 - forest fires, ocean circulation etc., made the atmospheric CO2 rise break another record, but several temporary factors (e.g. reduced shipping sulphate, El Nino, solar cycle, etc.) contributed to that spike.