July 2, 2017, 5am PDT
The ecology of mountains around the world is changing as summer plants bloom earlier and forests march up hill to newly temperate ground.
May 26, 2017, 6am PDT
The side of Mount Everest is no place for a crowd.
October 3, 2015, 11am PDT
Unusually scarce precipitation last winter has left little snow on the mountains, endangering a key California water reserve.
November 13, 2009, 8am PST
An architect in Berlin has proposed replacing the city's now-unused Tempelhof airport with a giant man-made mountain, dubbed The Berg.