World Wildlife Fund
WWF is building a future where human needs are met in harmony with nature. WWF is challenging cities to do more than turn out their lights for Earth Hour. The Earth Hour City Challenge is a year-long competition among cities to promote renewable energy and prepare for climate change. U.S. cities that participate are recognized for their efforts in spreading the global movement to create more sustainable, resilient cities and compete for the title of U.S. Earth Hour Capital as well as grants from WWF.