Considered the worst industrial accident in history. 25,000 people died because of the gas leak and 500,000 left with permanent injuries. How the accident occurred isn’t clearly known.

Whether directly or indirectly, intentional or unintentional, through negligence or even with due diligence, humans are especially skillful at creating disasters, a truth that is quite evident throughout history. As follows are but some of the worst man-made environmental disasters in history.