this post was submitted on 01 Oct 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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US to Cancel Billions for West Coast Hydrogen Hubs Amid Shutdown (www.bloomberg.com)
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[–] grue@lemmy.world 1 points 1 week ago (1 children)

Obviously, an H2 economy has to be green H2 based.

It has to be that to be a good thing, but it doesn't have to be that to exist. There are plenty of people pushing for spending $$$$$$$$$ on fuel cell cars and hydrogen fuel stations even when they're just being used with cracked natural gas for no actual environmental benefit.

It's like pretending your diesel car is green even though you've never put a drop of B100 in it.

Pure H2 will always be cheaper than e-fuels, because the latter is more steps.

At the point of production, sure. At the point of use, not so much, since hydrogen is so much more difficult/expensive to store and transport.

more range due to [H~2~] being the highest energy density fuel.

Energy density by weight, not by volume. It doesn't do much good to have longer range if you can't carry enough cargo because too much of the plane is taken up by fuel tanks.

[–] humanspiral@lemmy.ca 1 points 1 week ago

It has to be that to be a good thing, but it doesn’t have to be that to exist.

It actually does. Making H2 from NG, for heat/transportation, is using NG with extra expensive steps. H2 already exists as a fundamental chemical (including Ammonia) for agriculture and rocket fuel. An H2 economy is for expanded use, and green H2 is only economic possible case.

It doesn’t do much good to have longer range if you can’t carry enough cargo because too much of the plane is taken up by fuel tanks.

fatter planes with fatter delta wings.