Malthusianism, eugenics, and carrying capacity in the interwar period -- War and nature: Fairfield Osborn, William Vogt, and the birth of global ecology -- Abundance in a sea of poverty : quality and quantity of life -- "Feed 'em or fight 'em: population and resources on the global frontier...

We explore whether environmental motivation affects environmental behavior by focusing on volunteering. The paper first introduces a theoretical model of volunteering in environmental organizations. In a next step, it tests the hypothesis working with a large micro data set covering 32 countries...