Independent Voices is an open access digital collection of alternative press newspapers, magazines and journals.

Justseeds is a repository of free, high-res, downloadable graphics. It is an activist toolbox, a place to find images that speak to, and are created out of, a broad spectrum of social movements.

A guide to an exhibition by the Center for the Study of Political Graphics that includes various environmental protest images.

A guide to images and resources associated with Earth Day.

For the Documerica Project (1971-1977), the Environmental Protection Agency (EPA) hired freelance photographers to capture images relating to environmental problems, EPA activities, and everyday life in the 1970s

This exhibition is a global history of environmental activism through posters. Posters can be found at the bottom of the page.

This online textbook includes links to a number of environmental posters.