Earth Matters

Trump's executive order reopens door for controversial pipelines

Panda twins make adorable debut at China zoo

This photographer remembers the moment he fell in love with wild cats

A breathtaking look at our national parks in winter

9 extinct megafauna that are out of this world

Here's what it would be like to land on Pluto

Will tigers one day roam Central Asia again?

Critics weigh in on Al Gore's 'An Inconvenient Sequel'

SpaceX rocket makes picture-perfect landing in Pacific Ocean

Scientists finally explain mysterious 'fairy circles' found in Namibia

2016 was the hottest year on record

Massive Antarctic ice crack shutters British research station