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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[–] protist@mander.xyz 30 points 8 months ago* (last edited 8 months ago)

Really disturbing that the right axis is trending logarithmic

[–] 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.

[–] hperrin@lemmy.world 12 points 8 months ago

This will be the coldest year of the rest of our lives.

[–] ninpnin@sopuli.xyz 10 points 8 months ago

Looks like we’re gonna be breaking records this year 😎😎🔥🔥

[–] EdibleFriend@lemmy.world 6 points 8 months ago

I read this as I sit here comfortably in my car, window open and in a t shirt.

[–] NocturnalEngineer@lemmy.world 1 points 8 months ago (1 children)

What happened in 1980s to start this trend?

[–] Ranvier@sopuli.xyz 18 points 8 months ago* (last edited 8 months ago)

Sorry if this is just a facetious comment I'm replying to suggesting global warming didn't start until the 1980s. Anthropogenic global warming had been happening ever since fossil fuel emissions became widespread, but it is true that warming probably accelerated around then. One of the contributors, besides more co2 and other greenhouse gases, was a lot of action to reduce sulfate pollution in the 1970s. While sulfates are very harmful to human health and cause acid rain and all sorts of other badness, they were having a slight cooling effect. Also worrying is there are still large countries where sulfate emissions are less controlled, much to the detriment of the people that live there. However those sulfates may still be having a cooling effect, meaning our situation right now may be even worse than it seems with the sulfates still masking some portion of the warming.

https://www.sciencenews.org/article/50-years-ago-scientists-puzzled-over-slight-global-cooling