Forecasters say Nadine has blown up into a hurricane for a second time as it roams the eastern Atlantic.

David Doniger: Montreal Protocol shows global cooperation on climate change is possible.

The harvest moon, the full moon closest to the autumnal equinox, will rise Sept. 29.

The nation's worst drought in decades is ongoing for a large part of the lower 48 states.

Giant Indian Ocean quakes in April apparently are linked to later quakes around the world.