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Lake Xochimilco’s canals and island farms, on the southern tip of Mexico City, are on UNESCO’s World Heritage List. They are also imperiled by overdevelopment, pollution and climate. By Myriam Vidal In February, a crowd gathered around Mexico City’s Lake Xochimilco to witness the release of endemic salamanders called axolotls, culturally revered amphibians at risk of extinction because of the lake’s pollution.
 
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