|When is Earth Day in 2015?|
The date of Earth Day in 2015 is on Wednesday, April 22nd.
|What is Earth Day?|
Earth Day is observed on April 22 and was started in the United States in 1970 by Senator Gaylord Nelson to create awareness for the Earth's environment and to encourage conservation efforts. In 1990, Earth Day was taken international, and today, more than 500 million people in 175 countries observe Earth Day.