this post was submitted on 25 Jul 2026
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Climate

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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:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.

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[โ€“] switcheroo@lemmy.world 3 points 5 hours ago (1 children)

And the twats in the US "government" plan on using satellites to beam sunlight down at night, because we definitely need more fucking hot...

With luck this will get scrapped or they'll get sued. Seems like a stupid ass idea (imagine that).

[โ€“] sparkyshocks@lemmy.zip 2 points 4 hours ago

It's a stupid idea, but it also won't make a difference. Mirrors aren't going to increase the total amount of radiation hitting the Earth, in an amount that can actually make any difference.

The surface area of the Earth is 510,000,000 square kilometers. How much surface area of mirrors can they even fit in a sun synchronous orbit at the edge of dusk or dawn, where the satellite is catching sunlight but not casting a shadow over a part of Earth? Even if they put up a million satellites with mirrors that are 324 square meters that's only 324 million square meters, or 324 square kilometers. In other words, their most optimistic projection involves increasing sunlight by about 0.00006%.

It's a disaster for astronomy, and for ecological balance for any affected wildlife, but won't actually heat up the Earth.