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China leads nations with new climate plans, defying U.S. climate denial
(www.nbcnews.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.
And just a few years ago China was basically waving off climate change by giving it lip service and then producing well over the emissions they were claiming, basically thumbing their nose at the entire global community. Now they want to play ball. Even if they didn't come with a 30% reduction, this is a major step forward.