Don't be surprised if you find your neighbors turning off their lights for a full hour Saturday night. They're taking part in a global movement called Earth Hour. The symbolic effort started in 2007 ...

This Saturday, people in more than 7,000 cities, towns and campuses around the world will click off their lights, unplug their electronic gadgets and spend an hour thinking about how to live more ...

A lightning show was the brightest part of Sydney's skyline during Earth Hour, which began at 8 p.m. when the lights were turned off at the city's landmarks. Most businesses and homes were already ...