this post was submitted on 25 Mar 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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This is how big one tonne of CO2 is (slrpnk.net)
submitted 7 months ago by [email protected] to c/[email protected]
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[–] [email protected] 71 points 7 months ago (3 children)

At what sort of pressure?

[–] [email protected] 76 points 7 months ago (1 children)

1 atmosphere, so sea level pressure, per Diána Ürge-Vorsatz

[–] [email protected] 22 points 7 months ago (1 children)

I feel like a ton of C02 at air pressure should be bigger.
I know it's correct, but it looks like the amount of exhaust produced by a car idling for a few minutes, at a visceral level you just expect a literal tonne of gas to take up more volume.

[–] [email protected] 5 points 7 months ago* (last edited 7 months ago)

I assume CO2 is only a portion of the exhaust. Not sure if that’s what you were meaning already?

Edit: No idea of the quality of this source, but:

So what's coming out of a car exhaust is 13 per cent CO2, 13 per cent water (26 per cent sub-total) and 73 per cent nitrogen gas. The air that you're breathing right now is 78 per cent nitrogen gas, 21 per cent oxygen, and one percent everything else.

[–] [email protected] 27 points 7 months ago (2 children)

At what temperature?

[–] [email protected] 36 points 7 months ago (1 children)

Whatever it was about on Jan 27, 2024 in Vienna in the evening during the Science Ball. Probably about 10°C

[–] [email protected] 1 points 7 months ago* (last edited 7 months ago) (1 children)

But at what pressure?

[–] [email protected] 8 points 7 months ago

~1 atm/bar.

[–] [email protected] 4 points 7 months ago

1 atm.