this post was submitted on 17 May 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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Europe's Spending Billions on Green Hydrogen. It's a Risky Gamble (www.bloomberg.com)
submitted 6 months ago by silence7@slrpnk.net to c/climate@slrpnk.net
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To be clear: we're going to use renewable hydrogen for some things, such as fertilizer manufacturing โ€” there isn't any other way to do them sustainably. There are applications for which it's one of the most expensive choices, such as home heating, and a whole host of industrial processes and aviation sitting in between.

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[โ€“] sonori@beehaw.org 3 points 6 months ago

Why are you expecting that hydrogen to be made into electricity? While there are silly ideas like using it in small scale applications like cars or buses, most hydrogen is used to produce things like fertilizer or steel, and while there are newly developed processes that are less reliant on hydrogen, we are unlikely to be able to scale them up drom lab sized for decades.

Being able to replace this hydrogen with stuff made from solar power rather than methane steam reformation would present a major reduction in emissions, and at the rate we are building out renewables it is far more likely that we will have the necessary renewables long before we have scaled up the alternative processes.