Earth Day 2026: A Global Call to Collective Climate Action Today, Wednesday, April 22, 2026, the world marks Earth Day under the global theme “Our Power, Our Planet.”. This year’s theme emphasizes the power of people, communities, and businesses to protect the natural systems that underpin health, economies, and global security. What began in 1970 as a U.S. environmental teach-in, inspired by rising concerns over pollution and ecological degradation, has grown into one of the