Conversation so far:
what was the impact of rachel carson's book silent spring
Carson's work had a powerful impact on the environmental movement. Silent Spring became a rallying point for the new social movement in the 1960s.
when was the publishing date for the book Silent Spring
Silent Spring was published on September 27, 1962.
what genre was the book Silent Spring classified under
Silent Spring is an environmental science book.
what government agency was created as a result of the public's reaction to Silent Spring
Silent Spring helped to inspire an environmental movement that led to the creation of the U.S. Environmental Protection Agency.

Question: what is the purpose
Self-contained rewrite: what is the purpose of the U.S. Environmental Protection Agency