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This Scientist Wants to Block the Sun to Cool the Earth
(www.nytimes.com)
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:
How much each change to the atmosphere has warmed the world:
Recommended actions to cut greenhouse gas emissions in the near future:
Anti-science, inactivism, and unsupported conspiracy theories are not ok here.
It's a bit more than a math equation; things like how much ice there is are meaningfully path dependent. Just dropping CO2 concentrations won't get us back the world we had.
That's just another part of the equation.