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Bill Gates Says Climate Change ‘Will Not Lead to Humanity’s Demise’
(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.
Humanity will suffer massive population decline for sure, but we have spent thousands of years living in deserts and artic conditions so species survival is pretty much guaranteed no matter how terrible it gets.
It is unlikely that modern technology will be retained though. Just too many interconnected parts spread across continents to survive a mass population decline.