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Sierra de Manantlán is a 140,000-hectare biosphere reserve in west central Mexico. It is home to 3,000 plant species and a forest whose soils and limestone mountains enable purified water to reach the nearby town of Colima. Twenty years ago, researchers at the University of Guadalajara in Mexico proposed that Colima should consider paying to use the forest’s clean water, and that the money could go to supporting the biosphere reserve’s inhabitants.
