Environmental Protection Agency (EPA)
The EPA's mission is to protect human health and the environment. They provide information on issues facing the environment, science and technology, rules and regulations, and much more.
U.S. Fish & Wildlife Service
Provides information on endangered species, national wildlife refuges, and regulatory policy information.
Environment and Natural Resources Division (Department of Justice)
"The Environment and Natural Resources Division of the Department of Justice handles environmental and natural resources litigation on behalf of the United States. The work of the Division arises under approximately 150 federal civil and criminal statutes, including the Clean Air Act, Clean Water Act, CERCLA (Superfund), Safe Drinking Water Act, Endangered Species Act, Marine Mammal Protection Act, National Environmental Policy Act, Surface Mining Control and Reclamation Act, and Tucker Act."
Council on Environmental Quality
"The Council on Environmental Quality (CEQ) coordinates Federal environmental efforts and works closely with agencies and other White House offices in the development of environmental policies and initiatives."
National Oceanic and Atmospheric Administration
A large governmental organization the NOAA provides information on weather, climate, ocean coasts, fisheries, satellites, research, marine aviation, charting, and sanctuaries, among other information.