this post was submitted on 05 Dec 2023
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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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The climate change we caused is here for at least 50,000 years – and probably far longer (theconversation.com)
submitted 11 months ago by GreyShuck@feddit.uk to c/climate@slrpnk.net
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In February 2000, Paul Crutzen rose to speak at the International Geosphere-Biosphere Programme in Mexico. And when he spoke, people took notice. He was then one of the world’s most cited scientists, a Nobel laureate working on huge-scale problems – the ozone hole, the effects of a nuclear winter.

So little wonder that a word he improvised took hold and spread widely: this was the Anthropocene, a proposed new geological epoch, representing an Earth transformed by the effects of industrialised humanity.

The idea of an entirely new and human-created geological epoch is a sobering scenario as context for the current UN climate summit, COP28. The impact of decisions made at these and other similar conferences will be felt not just beyond our own lives and those of our children, but perhaps beyond the life of human society as we know it.

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[–] sonori@beehaw.org 1 points 11 months ago

Um, in what part did I say that this was in any way easier than parting with fossil fuels or capitalism. Indeed solar shades wouldn’t be compatible with continuing emissions, but would only represent a pathway to returning the climate to pre industrial temperatures.

The main reason I suggested solar shades pver most forms of geoengineering is precisely because it’s vanishing unlikely to have large scale unintended consequences. Solar output already slightly varies throughout both the year and solar cycles, shades would be able to just keep it at those lower outputs. It might still have consequences, but it’s vanishing unlikely they’ll be worse than climate change.

Also, cubesats with a big sheet of tin foil taped to them arn’t all that sifi, and the biggest tech leap would be making that tin foil out of lunar regolith. It also wouldn’t be a very capitalist solution because it is overtly non-profitable, but tech wise we could have done it in the 90s if we really wanted to, and have already built satellite constellations of similar scale.