Expedition discovers new source of greenhouse gas off East Siberian coast has been triggered.
A letter signed by hundreds of scientists calls for global action to protect whales, dolphins and porpoises.
The analysis, by European scientists, kept this year on track to be one of the five hottest in recorded history.
Beijing's latest energy policy will sharply increase wind and solar, but can't save the climate on its own.
A big chunk of ice breaks away from the Arctic's largest remaining ice shelf - 79N, or Nioghalvfjerdsfjorden.
Animal populations have plunged an average of 68% since 1970, as humanity pushes the planet’s life support systems to the edge.
Greenland's ice sheet may have shrunk past the point of return, with the ice likely to melt away no matter how quickly the world reduces climate-warming emissions, new research suggests.