Volunteers dress themselves up as trees to arouse people's awareness on environment protection at the Union Sqaure in New York, the United States, on April 22, 2009. Volunteers here on Wednesday distributed flower seeds and cards with tips about environment protection to passersby to mark the annual Earth Day. [Xinhua]

A volunteer of the U.S.-based conservation group Rainforest Alliance holds flowers and a card written "shop sustainbaly" at the Union Sqaure in New York, the United States, on April 22, 2009. Volunteers here on Wednesday distributed flower seeds and cards with tips about environment protection to passersby to mark the annual Earth Day. [Xinhua]