New research suggests that penguins' ancestors originated not in frozen Antarctica but, instead, off the coasts of Australia and New Zealand, adapting to new climes over 22 million years.
Environmental groups plan to sue to protect the breeding ground for caribou and polar bears. But if a drilling lease is sold, it could make it harder for a future president to reverse the move.
The Trump administration is pushing ahead with plans to allow drilling in Alaska's Arctic National Wildlife Refuge. The decision is a key moment in a decades-long environmental battle.
Any visitors to the national park are getting blunt advice: "Travel prepared to survive." It's part of a heat wave that is forcing rolling blackouts in the West.
The Trump administration is planning to withdraw William Perry Pendley as its nominee to lead the agency. Pendely has faced criticism for past statements in support of selling off public land.
Deforestation in the Brazilian Amazon is on the rise. With fire season underway, the rainforest faces the threat of even more destruction. But President Jair Bolsonaro dismisses those fears as a lie.
Kenya's elephant population has more than doubled since the 1980s, and one national park is currently having a 'baby boom' thanks to a relief from drought and a drop in poaching.
Two back-to-back wildfires have erupted around Los Angeles. And across the country, major wildfires are burning in a dozen states, including one of the largest in Colorado's history.