Watch this first amazing video. It is 16-minute long but worth every second (and see this BBC background page):

Those of us old enough to have lived through the 1980s remember Bhopal as a major industrial disaster in 1983. On December 3, 1984, a Union Carbide pesticide plant (UC was bought by Dow Chemical in 2001) released poisoned gas that killed an official estimate of approximately 3,800 people (actually doctors on site claim that 15,000 died within a month). Over 500,000 have been affected by inhaling the gas.

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