We're locked in now. Blew past red lines decades ahead of schedule. Damage done. We're in the shit now.
While it's true we are in the shit, making changes now can still dramatically effect the severity of the shit we're in.
And that would be amazing. It would save millions of lives. Prevent a few wars. But do you really expect the businesses responsible for the lions share of damage to (for the first time ever) prioritize lives above profit?
I expect them to prioritize profits, but we can still fight them in the courts, and in the streets, and in peoples' minds and hearts.
Would depopulation not have a knock on effect though (not enough for sure) or is that accounted for?
They're just happening on different timescales
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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:
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