American biologist well known for her writings on environmental pollution and the history of the sea. Rachel Carson was an author whose book Silent Spring and other writings are credited with advancing the global environmental movement. 

The Sierra Club is an environmental organization in the United States. Sierra Club American conservation group American organization for the conservation of natural resources. 

This organization is dedicated to preserving endangered animals, preventing environmental abuses, and heightening environmental awareness.

The Arbor Day Foundation largest nonprofit membership organization dedicated to tree planting. The Foundation's stated corporate mission is "to inspire people to plant, nurture, and celebrate trees."

Love Canal, a neighborhood in Niagra Falls that was the site of the worst environmental disaster involving chemical wastes in U.S. history. The resulting cleanup operation under the Superfund law demolished the neighborhood, wrapping up in 2004.

Accident at the Chernobyl nuclear station in the Soviet Union, the worst disaster in the history of nuclear power generation. The Chernobyl accident in 1986 was the result of a bad reactor design that was operated with poorly trained personnel.

The Gulf Oil Spill is recognized as the worst oil spill in U.S. history. It was caused by explosion on the Deepwater Horizon oil rig located in the Gulf of Mexico