A rare dolphin, thought to be extinct, may have been sighted swimming in the Yangtze River in China. But scientists fear that even if the sighting of the Baiji, or Yangtze river dolphin, is confirmed it may be too late to bring the species back from the dead.

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"For decades we have made the mistake of believing that in order for civilization to advance, we must destroy our natural resources, establishing cities and communities at a great cost to our environment..." Mexico's president Felipe Calderon said, announcing the new protected  …

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