this post was submitted on 02 Dec 2023
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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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Biden Administration raises social cost of carbon (used in regulatory decisions) from $51/ton to $190/ton (www.nytimes.com)
submitted 11 months ago by silence7@slrpnk.net to c/climate@slrpnk.net
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The higher the number, the greater the government’s justification for compelling polluters to reduce the emissions that are dangerously heating the planet. During the Obama administration, White House economists calculated the social cost of carbon at $42 a ton. The Trump administration lowered it to less than $5 a ton. Under President Biden, the cost was returned to Obama levels, adjusted for inflation and set at $51.

The new estimate of the social cost of carbon, making its debut in a legally binding federal regulation, is almost four times that amount: $190 a ton.

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[–] benjhm@sopuli.xyz 3 points 11 months ago

You are right, but these numbers are intrinsically affected by value-judgements - about how to integrate impacts over time, across different sectors, across rich and poor countries/communities and over probability of such impacts (risk aversion). It's not so much the science changing, but the values - hence political shifts. It would help if experts could separate these factors more clearly. For example people mention "the discount rate", but there is not just one - there is a (low) pure time preference for the whole world and higher rates for individuals and companies with finite lifetimes, also higher in rapidly developing countries (this does make sense, given a non-linear welfare function).