When it comes to elevation, the United States is a country of extremes.

A technique using satellites to create twice-yearly elevation maps of US mountain glaciers provides new insight into thinning of glaciers in the lower 48 states.

The United States serves as the chair of the Arctic Council through Spring 2017 when the position rotates to Finland for two years.

New data shows that water levels in major reservoirs including Lakes Mead and Powell are well below average for this time of ...