Unknown.
READ MORE ABOUT:
Discovery headquarters will be taking part in Earth Hour on March 29 by turning off its lights from 8 p.m. to 9 p.m. We hope you'll participate in this global effort to raise awareness about electricity conservation by switching off your office lights and equipment as you leave, and then going dark at home on Saturday.
Learn more about the World Wildlife Fund-back event by visiting the event's official Web site.
Difficulty level: Easy
-
- {}
