Flick your switch off for Earth Hour

Do you want to show you care about energy conservation? Simply switch off your lights on March 28 from 8:30 to 9:30 p.m., local time.

This is Earth Hour, and Saturday is the third annual worldwide event. Earth Hour is both a symbolic act and the start of a practical habit.

Millions of homes and businesses and hundreds of major landmarks will go dark for one hour to show that energy conservation is important.

Lighting accounts for about 11 percent of a typical American home's energy bills, while computers and electronics add another 9 percent.

Some famous buildings will be going dark today including: The Empire State Building in New York City, the Eiffel Tower in Paris, the St. Louis Gateway Arch, the Sydney Opera House, the Sears Tower in Chicago, Seattle's Space Needle, the Great Pyramids and Sphinx in Egypt, the Golden Gate Bridge in San Francisco, and Broadway theater marquees in New York City.

So do your little part and turn off the lights for an hour!