this post was submitted on 07 Oct 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.

Recommended actions to cut greenhouse gas emissions in the near future:

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See the Ocean Heat Fueling Hurricane Milton, in One Chart (www.nytimes.com)
submitted 1 week ago by silence7 to c/climate
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[–] xpinchx@lemmy.world 3 points 1 week ago (1 children)

How many degrees are off from the avg tho? Just something to compare it to.

[–] dgriffith@aussie.zone 6 points 1 week ago* (last edited 1 week ago) (1 children)

Look at the averages on that chart. Eyeballing it, the average should be around 70 kJ/cm2, currently it's about 85.

So it's about 20 percent more energy.

It doesn't translate directly to temperatures as the values represent how much energy is in a column of water that is 1cm2 at the top, and that column extends down until the water temperature drops below 26 degrees Celsius.

So it could be that the top of the column of warm water is mostly the same temperature as before but extends deeper, as opposed to the top of the column being a lot hotter than usual.

When the column is shorter, a hurricane will mix it with cooler water lower down via wave action, reducing the amount of energy available after it passes by. This year the column of water is deeper than usual, which allows two hurricanes to develop over the same patch of ocean in quick succession.

[–] xpinchx@lemmy.world 3 points 1 week ago

Thanks for the explanation 👌