7,000 cities around the world will be participating in the Earth Hour Challenge Saturday night between 8:30-9:30 p.m. It started with one city in 2007 and is now sponsored by the World Wildlife Fund. People are asked to turn out their lights for one hour to show concern for the environment.
Keya Chatterjee is the organization's Director of Climate Policy. She says 29 cities are also participating in the Earth Hour City Challenge and Cincinnati is one of three finalists. The other finalists are San Francisco and Chicago. A winner will be announced during Earth Hour.