Climate change

GiveWell has a page on Anthropogenic climate change.

Giving What We Can has conducted a brief search for relatively effective means of reducing greenhouse emissions, focusing largely on charities. Cool Earth was evaluated as most effective among the options considered. Cool earth is estimated to reduce emissions by one tonne of carbon dioxide equivalent for $0.81.

See Katja Grace’s first and second posts about strategies to mitigate climate change and related charities.