this post was submitted on 17 Jun 2023
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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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Please also see !cdr (slrpnk.net)
submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]
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I'm running a community at https://slrpnk.net/c/cdr but not sure how discoverable it is right now. Some of you might find it interesting (if anyone joins, and I actually start posting regular content).

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[โ€“] [email protected] 1 points 1 year ago (1 children)

Yes BECCS is a thing on paper. There's even one contract that Microsoft has signed for a small amount of it. It's going to be limited in scale though: the quantity of biofuels that can be sustainably produced is limited.

You need to get fossil fuel use to near zero for these to do what we need.

[โ€“] [email protected] 1 points 1 year ago

DAC and BECCS are just two of many options. A lot of CDR choices will be based on location - what resources are available for moving CO2 from air to concentrated forms, and what means are available for keeping it in that form a long time. Silicate rock, crushed to dust, can "weather" to carbonate minerals relatively fast. There are a whole range of biomass conversion options - depending on what ecosystems are in a place, or can be established with local benefit. And for sequestering, there are also various ways to go.

And absolutely all of the CDR in the world will be wasted if we keep burning fossil fuels. But there are some fossil fuel uses that will be very difficult to eliminate, and there is all that legacy CO2 already in circulation - we have to do both; we have to achieve negative CO2.