Nearly 4,000 species of microorganisms were found in the cold, dark waters of Lake Whillans, which sits about half a mile below Antarctica’s ice sheet.
The Aral Sea - once the fourth largest inland sea in the world - has been shrinking markedly since the 1960s. Now its eastern basin has completely dried.
While some wetland birds in the U.S. appear to be doing well because of conservation programs, other birds are experiencing steep declines in population numbers.
Experts used “scenarios” to suggest global human population will stabilize around 9 billion by about 2050. A new statistical analysis tells a different story.