"On the Brink" (Part 1 of 3) examines the link between environmental pressures and political instability in visits to South Africa, Bangladesh, Peru and Haiti, and the U.S.-Mexican border. In Bangladesh, monsoon-season flooding often turns catastrophic; at other times of the year farmers face drought. In Peru, land scarcity led to a bloody insurrection. And in Haiti, deforestation provides "a case study of a country verging on a complete economic and environmental collapse." Matt Damon narrates.
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