epa01317921 (FILE) A file picture dated 11 July 2007 shows a man collecting dead fish in Guanqiao Lake in Wuhan in central China’s Hubei province, which died due to the polluted lake water and the sizzling weather in the city. On 22 April 2008, Earth Day is celebrated in many countries to inspire awareness of and appreciation for the earth’s environment. EPA/ZHOU CHAO