Also on the mall, university students were competing in the 8th annual National Sustainable Design Expo, which is hosted by the Environmental Protection Agency.
And an "EcoVillage" featured interactive exhibits and renewable energy demonstrations from exhibitors including NASA and the United Nations.
Tens of thousands crowded the mall two years ago to hear Sting, Jimmy Cliff and other musicians play on the 40th anniversary of the first Earth Day. The event wasn't held last year because Earth Day fell on the same weekend as Easter and Passover and because of the economic downturn, Rogers said.
As for the condoms, the Center for Biological Diversity handed those out this week to 1,200 volunteers to distribute at more than 80 college campuses.
"What better day than Earth Day to get people talking about overpopulation and its environmental impacts," Amy Harwood, who runs the group's population campaign, said in a statement. "The world population has doubled since the first Earth Day 42 years ago, and yet today that rarely gets talked about. But the fact is that we add 80 million people to the planet each year, leading to pollution, habitat destruction, and the prospect of extinction for thousands of species already living on the brink."
Intellpuke: You can read this article by msnbc.com Correspondent Miguel Llanos in context here: usnews.msnbc.msn.com/_news/2012/04/22/11336848-earth-day-events-from-condoms-to-national-mall-concert?lite