A yearly event, Earth Day is meant to show broad support and enthusiasm for the causes of protecting the environment and living in close harmony with the natural world. Beginning in 1970, Earth Day has been observed on April 22, though there are countries that mark the occasion on either March 21 or 22, the date each year when night and day are of equal lengths. 2009 witnessed a proclamation by the United Nations General Assembly in which April 22 was declared to be International Mother Earth Day.
On Earth Day, it is customary to plan community-wide activities that focus on the ecology, such as collecting garbage, planting new trees and the like. The occasion is also ideal for programming that is designed to raise awareness on topics ranging from climate change, air pollution, organic farming and clean water initiatives.