Earth Hour is a world-wide event to symbolize “commitment to the planet,” whatever that is. It consists of turning off non-essential lights for one hour of one night per year. If it’s so honorable why not turn off your lights for the whole night? Every day of the year?
They celebrate it every day in North Korea. See.
And also see “Earth Hour: A Dissent” by Ross McKitrik at WattsupwithThat.