this post was submitted on 10 Jan 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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Hottest year on record sent planet past 1.5C of heating for first time in 2024 (www.theguardian.com)
submitted 1 week ago by [email protected] to c/[email protected]
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cross-posted from: https://lemmy.world/post/24110139

Summary

In 2024, global temperatures rose 1.6°C above preindustrial levels, surpassing the 1.5°C Paris Agreement threshold for the first time.

The rise, driven by fossil fuel emissions and intensified by El Niño, caused extreme weather, record heatwaves, and widespread human suffering.

Experts warn the planet is on track for catastrophic 2.7°C heating by 2100 unless emissions drop 45% by 2030.

Despite renewable energy advances, 2024 saw record carbon emissions.

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[–] [email protected] 4 points 1 week ago (1 children)

2015 was last elnino (recent one ended in 2023), and all temperatures since 2015 were higher than 2015. 2023 seems to have been a step up, and 2024 follows the 2016 record (held until 2023) pattern. CO2 atmopheric increases this last year were well above the record past 10 year average.

next year it will be much less hot and all the climate deniers are going to look at the headlines like this from last year and hold snowballs and say how crazy we are are for thinking this is real.

A bold call there Cotton. There is no case for an expected downtrend in global temperatures. A 1.4C year is not a rally cry for everything is fine. A polar vortex, with snowballs, in winter does not mean a cooler global year.