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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.
Some models show that big swaths of the equatorial regions and the "monsoon belt" may become uninhabitable without AC because wet bulb temperatures will exceed 30C which is around the point where humans are no longer able to cool themselves. Since the global south is also less developed on average it means the electrical grid demand currently can't possibly handle that level of demand.