Pakistani students light candles to mark Earth Day in Karachi April 22, 2007. (Reuters)
People use chalk to draw on a street during celebrations to mark Earth day in Baguio, north of Manila April 22, 2007. (Reuters)
Young environmental activists demonstrate about global climate change on international Earth Day in central Madrid, April 21, 2007. Banner reads 'Our future'. (Reuters)
Mexican volunteers hold posters during a rally to mark Earth Day which falls on April 22 at Zocalo Square in Mexico City, capital of Mexico, April 21, 2007. (Xinhua)
Cyclists ride across the Chain Bridge during a Critical Mass ride to celebrate Earth Day in Budapest April 22, 2007. Critical Mass is a cycling event in which a large number of cyclists ride on the streets. (Reuters)
Dancers perform on an environmental art installation created with wood to symbolise illegal logging outside the Cultural Center of the Philippines to mark Earth Day in Manila April 22, 2007. (Reuters)
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