Scientists proved that the sea still holds some big mysteries after capturing footage of the colossal squid -- the largest invertebrate on the planet -- in its natural habitat for the first time.

A dire United Nations report, based on thousands of scientific studies, paints an urgent picture of biodiversity loss and finds that climate change is amplifying the danger to humanity.

One million species facing extinction, U.N. report warns 09:03. People are putting nature in more trouble now than at any other time in human history, with the risk of extinction looming over 1 ...