this post was submitted on 30 Mar 2024
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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:

Anti-science, inactivism, and unsupported conspiracy theories are not ok here.

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temperature timeline (imgs.xkcd.com)
submitted 8 months ago by Bridger@sh.itjust.works to c/climate@slrpnk.net
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https://imgs.xkcd.com/comics/earth_temperature_timeline.png

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[–] Hegar@kbin.social 80 points 8 months ago (2 children)

Humans reach North America is listed at ~16k years ago. That's based on the Clovis First model that was still dominant then.

Now we know small populations of humans were already in the Americas when this chart begins, having traveled along the coast from around what is today Japan.

Archaeology is progressing so quickly these days that even XKCD is no longer an up-to-date source!

[–] NightAuthor@lemmy.world 21 points 7 months ago

Damn, idk who to trust for information now if not wikixkcdia

[–] Snowcano@startrek.website 8 points 7 months ago (1 children)

What should I search for if I want to read up more on this? I hadn’t heard of these recent developments.

[–] Hegar@kbin.social 18 points 7 months ago (1 children)

"Kelp Highway" is a common name for the theory, since it involves exploiting rich marine ecosystems while expanding down the coast relatively quickly.

"Pre Clovis Sites" should get you to the level of specific digs.

"Western stemmed points" are the most solid link back to the cultures in East Asia after the last glacial maximum. I believe the genetic data is not as clear on this yet but is coming together.

The Oregon Archaeological Society's YouTube channel has a number of professional lectures for amateur enthusiasts that touch on this - https://youtu.be/KPpgn-NVeLI?si=SCKpePUNp3pKyPSa i think this is the one with a lot of info on the evidence for links to cultures in Japan.

[–] Snowcano@startrek.website 3 points 7 months ago

Rad, thank you!!