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What do an offshore wind farm in New York, a campaign to install 275,000 heat pumps in Maine, and the cancellation of the Keystone XL pipeline have in common? They were all the result of “community-based strategies” with involvement or leadership from local grassroots groups. Advocates say this is a powerful and relatively cheap way of driving climate action, especially as the Trump administration rolls back as much progress as it can.

A new report is the first to put hard numbers to that effectiveness in the United States and Canada. The analysis quantifies how much carbon a given law, protest movement, or clean energy project will keep out of the atmosphere. It also calculates the amount spent on

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