this post was submitted on 16 Aug 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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When Is “Recyclable” Not Really Recyclable? When the Plastics Industry Gets to Define What the Word Means. (www.propublica.org)
submitted 3 weeks ago by SteveKLord@slrpnk.net to c/climate@slrpnk.net
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Companies whose futures depend on plastic production, including oil and gas giant ExxonMobil, are trying to persuade the federal government to allow them to put the label “recyclable” on bags and other plastic items virtually guaranteed to end up in landfills and incinerators.

They argue that “recyclable” should apply to anything that’s capable of being recycled. And they point to newer technologies that have been able to remake plastic bags into new products.

I spent months investigating one of those technologies, a form of chemical recycling called pyrolysis, only to find that it is largely a mirage. It’s inefficient, dirty and so limited in capacity that no one expects it to process meaningful amounts of plastic waste any time soon.

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[–] chuckleslord@lemmy.world 1 points 3 weeks ago (1 children)

Only PETE and HDPE are truly recyclable (resin maker 1 and 2 (the "recycle triangle" on the plastic)). Every other plastic is either impossible to recycle from jump, or degrades every time it's recycled. I don't think "any new" plastic fits the reality.

[–] gila@lemm.ee 1 points 3 weeks ago

Almost any new plastic, by proportion of consumer plastics, mostly virgin PE & PET. As you mention, they degrade per cycle, which is why they end up in landfill regardless of being recycled.