Earth Day 2010 in Manhattan

A Pace College student in a gas mask "smells" a magnolia blossom in City Hall Park on Earth Day, April 22, 1970, in New York. Earth Day turned 40 yesterday and an estimated 1 billion people around the world will observe the anniversary with everything from tree planting events and local cleanups to a gathering of kite flyers
Photograph: AP

Volunteers from the Legg Mason company help plant a tree on Earth Day 2010, on Sherman Avenue in northern Manhattan's Washington Heights neighborhood in New York, joining 300 other volunteers in the Root for New York corporate challenge. New York Restoration Project and City Year New York joined to support MilllionTreesNYC, an effort to plant one million new trees across New York City by 2017
Photograph: Stan Honda/AFP/Getty Images

Actor Mathew Modine holds up a bike as part of Bicyle for a Day in Times Square during the official New York City Earth day 40th Anniversary Celebration
Photograph: Timothy A. Clary/AFP/Getty Images

New recycling bins line the street at an Earth Day event in Times Square on April 22, 2010 in New York City environment epa green pollution nature plants recycle
Photograph: Spencer Platt/Getty Images

A man looks at a new Chevy Equinox Fuel Cell car that will go 200 miles on a tank at an Earth Day event in Times Square, New York City
Photograph: Spencer Platt/Getty Images

'Solar powered' musicians perform in Times Square during the official New York City Earth day 2010
Photograph: Timothy A. Clary/AFP/Getty Images

Actors Ted Danson (left) and Sam Waterston place a bid during Christie's Green Auction, on the 40th anniversary of Earth Day
Photograph: Chip East/Reuters

Ford low-emission vehicles sit on display in front of the New York Stock Exchange in recognition of Earth Day in New York
Photograph: Peter Foley/Bloomberg/Getty Images