With climate change threatening the sea ice habitat of Emperor penguins, the U.S. Fish and Wildlife Service on Tuesday announced a proposal to list the species as threate...

U.S. land managers have begun efforts to capture about 50% more wild horses than originally planned this year because of severe drought across the U.S. West.

A 21-year-old free climber who was imprisoned two years ago for climbing the U.K.’s tallest skyscraper has scaled another building, this time to draw attention to climate...