A boy who was born with a mental disability looks out of a window at a rehabilitation centre supported by Bhopal Medical Appeal for children who were born with mental and physical disabilities in Bhopal November 11, 2014. The rehabilitation centre only treats families they believe have been affected by the Union Carbide gas leak 30 years ago. Human rights groups say that thousands of tonnes of hazardous waste remain buried underground, and the government has conceded it is contaminated. There has, however, been no long-term epidemiological research which conclusively proves that birth defects are directly related to the drinking of the contaminated water. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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