Below are some sites that have goals in-line with the EDF's, along with a short description of each group.
Defend Our Future - An organization dedicated to convincing politicians that climate change is a real and immediate issue. It advocates the fact that our doctors, scientists, and economists all warn of grave danger to our earth. Join their group to sway politicians to #ActOnClimate
As You Sow - A group that works to protect our planet through corporate action. As You Sow's goal is to create large-scale changes in climate thinking through changing corporate practices. By making people see that protecting our planet is an ethical responsibility, corporations will consider the environment more and more in the course of business.
Protect Our Winters - A group working targeting those interested in winter sports to act to protect our climate from the warming that is occurring. They primarily work through local activism, youth education, and general advocacy.