Report on the nonprofit environmental and conservation organizations in the United States

This study reveals a core of prominent national organizations and a larger, more rapidly growing universe of regional, local, and other specialized groups. Taken as a whole, the environmental movement expanded in number of organizations, members, and in total revenues almost every year since 1960. It focused less on advocacy than on projects and education, and was younger, more densely networked, and more dependent upon grants and contributions than was the nonprofit sector in general.