global warming

For 30 years, Lynn Davis has photographed the magnificent icebergs of Greenland. Davis returned recently with climate change expert Tony Leiserowitz, where they take in the meltdown, ...

Two astronomers go on a media tour to warn humankind of a planet-killing comet hurtling toward Earth. The response from a distracted world: Meh.

The world is stunned when a group of time travelers arrive from the year 2051 to deliver an urgent message: Thirty years in the future, mankind is losing a global war against a deadly ...