Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
International efforts to mitigate climate change are lagging behind. We study in an experiment a stylized climate club along the line of Nordhaus’s proposal to assess the behavioral effects on cooperation and surplus. We also evaluate in isolation the effects of different elements of the club design. Overall, a climate club increases cooperation but not surplus, with respect to voluntary cooperation in a baseline public good game.