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Slide 1: Bhopal

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World's worst During the early hours of 3 December 1984 the world's worst industrial accident unfolded in the Indian city of Bhopal. Poisonous gas escaped from a chemical plant and killed 3,000 people, according to official estimates. Other estimates put the number at between 8,000 and 10,000. Around 50,000 suffered permanent disabilities, and more died later.

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City in danger Many people lived in shanty towns built alongside the factory and thousands more lived nearby in the old city. There was no contingency plan for evacuation in the event of an emergency. Poor sales had led the company to cut costs, scale back production and lay off around a third of the workforce. Safety systems had also been cut.

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Lethal chemical The main ingredient of the pesticide made at the plant was a chemical called methyl isocyanate or MIC. MIC is one of the most toxic and lethal substances known to humans. Safe storage requires it to be kept cool and isolated from water, which can trigger a violent runaway reaction creating heat and a deadly gas.

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The leak A worker cleaning out pipes with water sparked the disaster. He did not use a basic but vital piece of equipment to isolate sections of pipe. Water got into the tank where the MIC was stored, raising the temperature to over 200 degrees Celsius (392F), creating the lethal gas. Several safety systems failed or were not working.

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Fallout Bhopal was asleep when the gas struck. Simple advice to move upwind or stay indoors and seal doors and windows with damp cloths could have saved thousands but Union Carbide had not told people what to do if there was a leak. Crowds of terrified people fled. Bhopal's hospital was overwhelmed, lacking information about the gas or antidote.

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Legacy Up to 500,000 survivors still suffer symptoms such as paralysis, partial blindness and impaired immune systems. Union Carbide accepted "moral responsibility" for the disaster. It later blamed sabotage by a disgruntled worker. After a legal agreement the firm provided victims with compensation averaging $500 (£300).

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Chaos and panic broke out in the city and surrounding areas as tens of thousands of people attempted to escape. More than 20,000 people have required hospital treatment for symptoms including swollen eyes, frothing at the mouth and breathing difficulties. Thousands of dead cats, dogs, cows and birds litter the streets and the city's mortuaries are filling up fast.

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