Living 20 million By Indy Staff Thu Apr 17, 2008 | 6:00am Share this: Click to share on Facebook (Opens in new window) Facebook Click to share on X (Opens in new window) X Click to email a link to a friend (Opens in new window) Email Click to print (Opens in new window) Print Add independent.com on Google Add the SB Independent as your preferred source to see more of our stories on Google. 20 million The estimated number of people who celebrated the first Earth Day in 1970. source: epa.gov/earthday/history.htm.
