Earth Day, celebrated annually on April 22, brings together millions of people worldwide to advocate for environmental protection and raise awareness about threats like pollution, climate change, and habitat loss. First held in 1970, it helped spark the modern environmental movement and led to landmark legislation including the Clean Air Act and the creation of the U.S. Environmental Protection Agency. Today it serves as both a call to action and a reminder that individual choices — from reducing waste to supporting conservation — can collectively make a meaningful difference for the planet.