this post was submitted on 01 Mar 2025
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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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[–] rekabis@lemmy.ca 2 points 15 hours ago

Exactly. And when you look at warming trends, we just went completely off the reservation, BEYOND the worst-case-scenario path. Humanity and science are very much in uncharted territory at this moment, and indications are that we will get shockingly close to +3℃ by about 2035… yes, we are now seeing an unprecedented and terrifying acceleration in warming.

So what does +3℃ entail?

Think lethally high wet bulb temperatures striking most regions between the Tropic of Cancer and the Tropic of Capricorn, where 4B people live. Not constantly lethal wet bulb temps, but frequently enough and for long enough that it becomes a “migrate or die” proposition. For FOUR BILLION people.

Think chaotic weather, bringing either too much or too little precipitation to the entire planet, when over 80% of all agriculture is absolutely dependent on getting the correct amount of rainfall at the right time. Extremely conservative projections are seeing up to 2B - one quarter of the world’s population - starving to death before 2040. And that’s just in the equatorial belts, where food insecurity is highest.

And those are just two of the high notes. We have additional calamities that have become foregone conclusions, such as the collapse of the AMOC - with a “most likely” date by the 2050s - that will plunge most of Northern Europe into a deep freeze and play additional havoc with weather around the planet as it whiplashes into a “new normal” over a decade or three.

I thought that most of the plunge of modern civilization would occur after I die of old age. Even with a functional healthcare system I will be lucky to make it to 2045, much less later. But with America in the active process of collapsing, and threatening to export it’s madness and chaos to other countries like Canada, it looks like I’ll have a front-row seat after all.