Hungary toxic sludge reaches Danube River: Top 10 environmental disasters worldwide

5. Bhopal gas leak, 1984

When a pesticide plant in Bhopal, India released a cloud of toxic gas, it killed more than 3,000 people in days, poisoned hundreds of thousands in the years after the accident, and killed 15,000 total, according to the Indian government. It is the most deadly manmade environmental disaster in history.

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