Earth Hour 2024 will occur on March 23 from 8:30 pm to 9:30 pm local time. The event, held annually toward the end of March, encourages individuals, communities, and businesses worldwide to turn off non-essential electric lights for one hour. The voluntary rolling blackouts are also observed by landmark structures such as the Eiffel Tower and the Empire State Building. They remind us of the urgent need to protect our planet.