Earth Hour asks people to turn out all non-essential lighting for one hour on Saturday, March 27 from 8:30 – 9:30 pm. It brings individuals, businesses, organizations and others together in calling for action on climate change. Orlando residents to sign up online, join the movement, plan events and be counted as part of Earth Hour 2010.Earth Hour asks people to turn out all non-essential lighting for one hour on Saturday, March 27 from 8:30 – 9:30 pm. It brings individuals, businesses, organizations and others together in calling for action on climate change. Orlando residents to sign up online, join the movement, plan events and be counted as part of Earth Hour 2010.