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 . Kuipers will watch the spectacle from orbit , sharing photos and live commentary on the event from space for the first time . 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 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 .