From May through October 2013, cities in 15 countries can register for the next annual round of WWF's Earth Hour City Challenge. The challenge will highlight and reward cities that aggressively and creatively address climate change. An international jury will evaluate the actions being taken by each city, and in March 2014, the city with the highest overall score will be awarded the title "Global Earth Hour Capital." A national Earth Hour Capital also will be named in each participating country.
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