Climate Change

Extinct smallpox virus could be resurrected by global warming

Leonardo DiCaprio's Oscar speech moved the needle on climate change

Did you know there are 8 types of glaciers?

You can help NASA track climate change from your phone

Sweltering 2016 is a warning from the future

Greenland tourism hub showcases natural beauty, perilously fast-melting glacier

'Watermelon snow' speeds Arctic melting

What are megaslumps, and how do they threaten our planet?

10 sobering vignettes of our new climate reality

7 monuments, cities and world treasures we could lose to rising sea levels

5 ancient civilizations that were destroyed by climate change