this post was submitted on 19 Dec 2023
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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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Is the US going to approve the single biggest fossil-fuel expansion on earth? | Biden has a chance to show that the world’s biggest exporter of oil and gas is actually going to change its ways. (www.theguardian.com)
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If you want to put your thumb on the scale to alter the odds of him doing the right thing, write Biden and ask him to reject the further expansion of fossil methane gas exports

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[–] benjhm@sopuli.xyz 1 points 2 years ago

Well, regarding CO~2~ globally on longish timesscale it seems the numbers add up, as there are multiple independent ways of checking the carbon budget - so if there would be a lot more emissions, we'd have to assume greater sinks to balance (the terrestrial biosphere sink is usually considered the greatest uncertainty). However for some trace gases such as HFCs, indeed it was found that measurements (even in middle of europe, e.g. at Jungfraujoch) sometimes indicated more emissions than governments were admitting to. For methane it's harder to say as there are also 'natural' sources, not so well quantified.