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Governments Knew the Risks of Global Warming as They Chose Fossil-Fueled Growth in the 1950s and ’60s
(insideclimatenews.org)
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.
Put in the words of that guy about hospitals closing "I don't believe it".