We run an experiment in five countries with 7,132 respondents to study how information about the behaviour of others affects contributions to climate change mitigation. Acting on behalf of their own countries, respondents receive information about the average contribution of four other...

Climate skeptics argue that the possibility that global warming is exogenous implies that we should not take additional action towards reducing greenhouse gas emissions until we know more. However this paper shows that even climate skeptics have an incentive to reduce emissions: such a change of...