This article examines willingness to join China's emerging green movement through an analysis of data from the China General Social Survey of 2006. A question asked about environmental NGO membership shows that while only 1 percent of respondents claim to be members of an environmental NGO, more than three-fifths say they would like to join one in future if there is an opportunity, slightly less than one-fifth reject the idea and the remainder are “don't knows.” The article tests explanations of (...) willingness to join based on instrumentality, ideology, social identity and social capital networks. It finds that instrumental considerations dominate, although ideology, identity and networks contribute incrementally. The conclusion considers the usefulness of willingness to join as an indicator of social cohesion within the framework of a wider effort to evaluate social quality. (shrink)