MSN: In a climate stag hunt, rules can be designed to ensure no single country wants to defect, and the rewards of mutual trust outweigh those from pursuing one’s short-term self interest, says Anders Fremstad, an environmental economist at Colorado State University. The Paris accord, unlike the Kyoto Protocol, is well designed to spur collaboration, but only, says Fremstad, if “the world can agree on which game we’re playing.

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