this post was submitted on 16 Jan 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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US in deep freeze while much of the world is extra toasty? Yet again, it’s climate change (apnews.com)
submitted 10 months ago by silence7@slrpnk.net to c/climate@slrpnk.net
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[–] LibertyLizard@slrpnk.net 22 points 10 months ago* (last edited 10 months ago) (2 children)

I don’t think this is really in line with current predictions. If you are referring to the weakening or collapse of the North Atlantic ocean currents, this will lead to substantially colder temperatures only for Northern Europe, though it will have other large effects on other regions as well. But it will not be comparable to an ice age from a global perspective—the rest of the world will remain extremely hot.

[–] Art3sian@lemmy.world 4 points 10 months ago* (last edited 10 months ago)

Yes, I’m referring to ocean currents and how I’ve understood it, is that they carry warm currents from the equator to the poles which is a main driver of warm weather cycling the planet.

Once the ocean currents stall we lose that warmth transference and everything subsequently freezes, and quickly. Not globally, but around the 30th latitude, north and south which is enough to make Europe, Asia, North America and half of Argentina near uninhabitable.

Correct me if I’m wrong but isn’t high C02 levels and global warming the reasoning behind the last Ice Age, circa. 11,000bc?

[–] nexusband@lemmy.world 2 points 10 months ago* (last edited 10 months ago) (1 children)

You do realize, the classification of having or being in an ice age is basically North- and Southpole are covered in ice/snow? We have not left the ice age.

An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers.

[–] LibertyLizard@slrpnk.net 2 points 10 months ago

Sorry I was speaking colloquially. I should have said glacial period.