April 22, 2018 N/A
Earth Day is a day early each year on which events are held worldwide to increase awareness and appreciation of the Earth's natural environment. Earth Day is now coordinated globally by the Earth Day Network, and is celebrated in more than 175 countries every year. In 2009, the United Nations designated April 22 International Mother Earth Day. Earth Day is planned for April 22 in all years at least through 2015.
John McConnell in front of his home in Denver, Colorado with the Earth Flag he designed.
The name and concept of Earth Day was allegedly pioneered by John McConnell in 1969 at a UNESCO Conference in San Francisco. Earth Day was first observed in San Francisco and other cities on March 21, 1970, the first day of spring in the northern hemisphere.