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Where should the United States focus its long-term efforts to improve the nation's environment? What are the nation's most important environmental issues? What

This report describes water quality in the United States using a set of 18 environmental indicators that measure progress toward national water goals and object

Although the environment of North America is not dissected by political borders, Canada and the United States often measure environmental conditions and report

Cities have experienced an unprecedented rate of growth in the last decade. More than half the world's population lives in urban areas, with the U.S. percentage