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Taking CO2 out of the air would be an absurdly expensive way to fight climate change
(www.theverge.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.
The tricky part is keeping the carbon in the plants. My grass clippings will decompose back into CO2 if you just dump it in a pile. A better option would be to dehydrate the clippings and bury it in a cave or something.
I also understand that there would be better plants than grass as well.