Corporate Knights asked environmentalists to rank past presidents accoring to their efforts to protect the natural world.
Public Citizen Founder Ralph Nader is one of the environmental leaders taking part in an event highlighting the "Greenest Presidents in U.S. History."
Participants include: Corporate Knights CEO Toby Heaps and Editor-In-Chief Tyler Hamilton; Friends of Earth President Erich Pica; Climate Progress Publisher Joe Romm; and Worldwatch Institute President Robert Engelman.
Corporate Knights, a research and financial products company focused on clean capitalism, publishes its magazine quarterly as an insert in the Washington Post.