After making landfall over mainland Mexico, Norbert weakened Sunday from a hurricane to a tropical storm, weather officials said.

In Australia, the world's driest inhabited continent, there is simply not enough water to go around. So farmers there rely on a unique trading system to make the most of every drop.

The Arctic has become more stormy in the past 50 years due to the warming climate, which in turn has quickened the pace of drifting sea ice, a new NASA study finds.

Hurricane Ike's winds and massive waves destroyed oil platforms, tossed storage tanks and punctured pipelines.