this post was submitted on 11 Dec 2023
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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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Annotated text, via Richard Delevan

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[–] Rentlar@lemmy.ca 16 points 9 months ago (1 children)

Ah yes. No meaningful change in action since last time. Just what we were expecting from a conference led by the President of a national oil company.

[–] floofloof@lemmy.ca 4 points 9 months ago* (last edited 9 months ago) (1 children)

I'm sure COP29 will get the job done. Or maybe COP30, or COP65...

[–] Rentlar@lemmy.ca 4 points 9 months ago

COP29 to be sponsored by Shell in Qatar.

But I really can't wait for COP30 sponsored by BP, to be held on the 20th Anniversary of the Deep Horizon incident! I'm sure there will be agreement to ceremonial dumping of oil into the Gulf of Mexico there.

[–] floofloof@lemmy.ca 11 points 9 months ago

Well at least we didn't expect anything useful to come of this conference, so we won't be too disappointed.

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

Well at least this COP has shown that this is not a developed countries vs developing countries situation.

[–] DeathsEmbrace@lemmy.ml 5 points 9 months ago

It's a private industry vs the world. Capitalism was the biggest mistake to have ever been created.

[–] Deme@sopuli.xyz 8 points 9 months ago

I admire the optimism of everyone who didn't expect this outcome

[–] jaybone@lemmy.world 5 points 9 months ago (1 children)
[–] silence7@slrpnk.net 12 points 9 months ago

Pretty much what happens when you let a petrostate host and give oil-dependent monarchs veto power over the text

[–] CJOtheReal@ani.social 3 points 9 months ago (1 children)

It doesn't say anything against nuking the countrys responsible for that...

[–] cerement@slrpnk.net 2 points 9 months ago (2 children)

will nuclear winter be enough to halt global warming?

[–] silence7@slrpnk.net 2 points 9 months ago

Yes, but it would be really nice to stabilize temperatures without killing the bulk of the human population

[–] sonori@beehaw.org 2 points 9 months ago* (last edited 9 months ago) (1 children)

More seriously, it would at best delay things for 10 years, and that’s if our current understanding of the climate turns out to be wrong and a nuclear winter could indeed actually happen in the first place.

The theory behind a nuclear winter was that in the 80s some scientists thought the secondary fires caused by detonating a bunch of nukes simultaneously in forested areas would combine to be powerful enough to carry the ash into the upper atmosphere. In the 2010s hover Australia had a wildfire big enough that according to the nuclear winter theory it should have easily demonstrated said effect, but dispite careful observation it didn’t, which is also what more modern climate science predicted.

Fun bonus fact: In a full scale nuclear war the majority of the projected casualties come from a breakdown in gobal trade leading to a lack of western produced fertilizer and subsequently food being grown in Africa. The same food production that is going to be heavily hampered by climate change. Thankfully there’s more time to mitigate it with climate change, but it’s still liable to be one of the biggest issues in a 2+C world.

[–] CJOtheReal@ani.social 1 points 9 months ago (1 children)

I mean when we nuke the right places the emissions would definitely drop significantly for a looooong time...

Less humans = less emissions

[–] sonori@beehaw.org 1 points 9 months ago* (last edited 9 months ago)

Possibly, but if your talking about an actual nuclear exchange rather than a rather dramatic reenactment of the French Revolutio it would probably just make things much much worse for the climate. Your at most looking at twenty five percent reduction in humans, and the remaining seventy five percent will probably be too busy repairing and rebuilding infrastructure to prioritize further emissions reductions.

Indeed since you now have a demonstrable reason to dedensify urban areas in favor of small towns, becuse things like batteries and solar panels have complex global supply chains while for much of the world oil, gas, and coal are available close by with easier to build infrastructure, and because you now need to make a vast quanty of new stuff to replace what was lost, well net result would almost certainly be a small drop followed by a continued increase in emissions for the next few decades before things got back to normal and decarbonization efforts could resume, now aiming to limit things to 4 to 6C.

[–] marcos@lemmy.world 2 points 9 months ago (1 children)

When did a COP ever create meaningful change?

It is happening anyway, whether the people there want it to or not.

[–] silence7@slrpnk.net 1 points 9 months ago

Largely not because the petroleum monarchies have the ability to block text they don't like.