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A lake which thousands of Guatamalans depend on for food and transport is under threat.Over the years, rubbish, sewage and dertilizers have polluted Lake Atitlan and its surrounding bay.Now a dangerous algae has contaminated the waters, threatening to destroy not only the lake, but also the livelihoods of the people who rely on it.Al Jazeera's David Mercer reports from Guatamala.