(120426) -- CIUDAD DE MEXICO, April 26, 2012 (Xinhua) -- An activist participates in a protest at Constitution Square, in Mexico City, capital of Mexico, on April 26, 2012. Activists made public a letter written to Mexican President Felipe Calderon asking for his intervention to prevent the death of 14,700 Mexicans each year due to diseases related to air pollution, as a result of the downgrade of environmental health laws in the country. (Xinhua/Pedro Mera) (zx)
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