I know that this is OT but then again maybe not:

On Saturday night at exactly 8:30, at least 538 cities in 75 countries worldwide, including the Philippines, will turn off the lights for one full hour in observance of Earth Hour, a global initiative that seeks to show everyone that it is possible to unite despite geographic distance, and take action against global warming.

Lights off, lights on.

I will be turning on all my lights for the hour. My kids suggested we get some spot lights for the outside of the house.