Study finds the sweet spot -- and the screw-ups -- that make or break environmental collective actions

Sustainability programs are a Goldilocks proposition -- some groups are too big, some are too small, and the environment benefits when the size of a group of people working to save it is just right. Scientists have found a sweet spot -- a group size at which the action is most effective. More importantly, the work revealed how behaviors of group members can pull bad policy up or drag good policy down.

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