The Environmental Defense Fund (EDF) is a membership interest group whose mission is to preserve natural systems and life. EDF focuses on climate change, oceans, ecosystems, and health. EDF President Fred Krupp appeals to members through purposive incentives by standing up for clean air, wildlife, and a stable climate. EDF takes more liberal positions and lobbies for policies like the EPA's Clean Power Plan to reduce greenhouse gas emissions, despite opposition from polluters and some state officials.