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Liberals Can't Address the Climate Crisis Because It Means Confronting Capitalism
(www.currentaffairs.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.
I think it became clear when the oil companies had their internal climate scientist prove it was them, and had that information leaked, and I believe that research was done 30 or 40 years ago?
Longer -- closer to 50 years ago.