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...Nber working paper series international environmental agreements among heterogeneous countries with social preferences charles d kolstad http www org papers w national bureau of economic research massachusetts avenue cambridge ma june comments from werner guth kaj thomsson and philipp wichardt discussions gary charness michael finus have been appreciated the views expressed herein are those author do not necessarily reflect circulated for discussion comment purposes they peer reviewed or subject to review by board directors that accompanies official publications all rights reserved short sections text exceed two paragraphs may be quoted without explicit permission provided full credit including notice is given source no jel h q abstract achieving efficiency many global problems requires voluntary cooperation sovereign due public good nature pollution abatement theory ieas in economics seeks understand how on can facilitated however why occurs when noncooperation appears individually ra...