this post was submitted on 02 Mar 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.

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[–] conditional_soup@lemm.ee 24 points 8 months ago (3 children)

So, when can we safely declare 1.5C dead? Because, um, well, it's not looking great.

[–] spaduf@slrpnk.net 22 points 8 months ago* (last edited 8 months ago) (1 children)

I would say yes, although there is the slim possibility that these few years are an outlier. No serious person should count on it, however, because the consequences of being wrong in spite of what we're seeing are downright apocalyptic.

[–] Ranvier@sopuli.xyz 9 points 8 months ago* (last edited 8 months ago) (1 children)

This is an El Nino year too, La Nina years will drag down the average somewhat. You can even see the inflection in the chart when el Nino started. Though obviously the charts are not looking great, with or without El Nino.

[–] spaduf@slrpnk.net 9 points 8 months ago (1 children)

While true, it's important to remember that 1.5 was the goal for 2050 (as a 30 year average). That seems fairly unlikely at this point

[–] Ranvier@sopuli.xyz 5 points 8 months ago

Oh I agree, absolutely. Just thought I'd add that as some people might wonder what that big jump was halfway through last year.

[–] FrenziedFelidFanatic@yiffit.net 6 points 8 months ago

Once El Niño is done. This year is likely anomalous compared to average, but is likely the new normal for El Niño years. I’d say wait until the next ‘normal’ year ( not El Niño nor La Niña) to declare anything. That being said, you could claim that it is certainly going to die with low risk of being wrong.

[–] hperrin@lemmy.world 5 points 8 months ago

We’re already past 1.5C.