The environment of the United States comprises diverse biotas, climates, and geologies. This diversity leads to a number of different distinct regions...

The United States of America is a federal republic consisting of 50 states, a federal district (Washington, D.C., the capital city of the United States)...

The Environmental history of the United States covers the history of the environment over the centuries to the late 20th century, plus the political and...

The United Nations Environment Programme (UNEP) is responsible for coordinating responses to environmental issues within the United Nations system. It...

The United States Senate Committee on Environment and Public Works is responsible for legislation and oversight of the natural and built environment and...

The United States of America (USA or U.S.A.), commonly known as the United States (US or U.S.) or America, is a country primarily located in North America...

The following outline is provided as an overview of and topical guide to the United States: United States of America – federal republic located primarily...

The term "United States," when used in the geographical sense, refers to the contiguous United States (sometimes referred to as the Lower 48, including...

The Environmental Protection Agency (EPA) is an independent agency of the United States government tasked with environmental protection matters. President...

the practice of protecting the natural environment by individuals, groups and governments. Its objectives are to conserve natural resources and the existing...