Earth Hour requires individuals and businesses to turn off their lights at 10 p.m . The Sydney Opera House , Empire State Building and Trump Tower will go black . Organizers have pledges from 147 countries and over 5,000 cities to go dark . An astronaut on the International Space Station will blog on event from orbit .
Earth Hour asks individuals and businesses to turn off their lights at 8:30 p.m . The Sydney Opera House , Empire State Building and Eiffel Tower will go black . Organizers have pledges from 147 countries and over 5,000 cities to go dark . An astronaut on the International Space Station will blog on event from orbit .