this post was submitted on 02 Feb 2024
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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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Could a Giant Parasol in Outer Space Help Solve the Climate Crisis? Time and money would be better spent on working to reduce greenhouse gas emissions and removing carbon dioxide from the atmosphere (www.nytimes.com)
submitted 9 months ago by silence7@slrpnk.net to c/climate@slrpnk.net
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[–] Zaktor@sopuli.xyz 3 points 9 months ago (1 children)

The idea is less umbrella and more parasol. Tiny holes would be just fine.

[–] sonori@beehaw.org 2 points 9 months ago

To add on to that, in more serious proposals, the idea is to mass manufacture a lot of small satellites you could hold in your hand, attached to about a km or so of hyper thin foil. At obital velocity, any micrometeorites or other object will flash vaporize an equal sized hole on contact, and indeed this is how we do modern micrometeorite shielding for spacecraft today.

We just care about blocking a tiny fraction of relevant sunlight, holes don’t really effect the outcome compared to the negative space around the satellite.