Powerful earthquake shakes southern Peru

The U.S. Geological Survey said a magnitude 7.2 earthquake shook southern Peru on Thursday, though there were no immediate reports of damage or injury.

Cleaner air leads to more hurricanes in the Atlantic, study finds

A new study links how many hurricanes form worldwide to air pollution levels. Wednesday's study from the National Oceanic and Atmospheric Administration says cleaner air in Europe and the United States is helping trigger a dramatic increase in the number of Atlantic hurricanes.