The United Nations celebrates Earth Day on the March Equinox. The United States celebrates this observation on April 22nd. It is observed to bring attention to global environmental issues.
 
 
Recommended Resources
Offers information about environmental activism, educational resources and Earth Day events and actions.
http://www.earthday.org/
Features the history of Earth Day along with resources for kids, volunteers and activists.
http://www.epa.gov/earthday/
Contains a wide range of nature, butterfly and caterpillar crafts as well as printable worksheets and books.
http://www.enchantedlearning.com/crafts/earthday/