A new satellite study shows traffic on the world's oceans quadrupled over two decades, outpacing the growth in trade.
A town lies in ruins after twisters touched down in northeastern Nebraska on Monday.
The awe-inspiring bears are almost extinct in Washington State, but the government is now studying whether they should be brought back.
In 2012, Sombath Somphone vanished at a police stop. It was caught on camera. "They have to let him go," his wife thought then.
The popular bug-repelling chemical DEET has lost its power against some disease-carrying mosquitoes, a new study says.
In 1921, 20 miners died fighting for labor rights on West Virginia's Blair Mountain. Now coal firms want to literally open the mountain for business.
The barbastelle bat has lowered its voice to evade detection by moths with keen hearing, a new study says.
Recent revelations that Tanzania's once vast herds are vanishing come as no surprise, says leader of the Environmental Investigation Agency.
The number of migrating monarch butterflies hit a record low in Mexican forests in 2013, a new report says.
A NASA simulation reveals the secret swirlings of the main culprit in climate change.