A demonstrator throws kerosene oil on an effigy depicting Dow Chemical Company, which now owns Union Carbide, to burn it during a protest to mark the 30th anniversary of Bhopal gas tragedy in Bhopal December 3, 2014. In the early hours of December 3, 1984, around 40 metric tonnes of toxic methyl isocyanate gas accidentally leaked from a pesticide factory owned by U.S. multinational Union Carbide Corp. and was carried by the wind into the surrounding slums. The government recorded 5,295 deaths. Activists estimate 25,000 people have died from illnesses in the years since. Many more, they said, are dealing with cancer, blindness, respiratory difficulties and immune and neurological disorders, but with no support. REUTERS/Thomson Reuters Foundation/Nita Bhalla (INDIA - Tags: CIVIL UNREST DISASTER SOCIETY) 

Zubeida Bi is poses for a photograph in Bhopal November 11, 2014. Bi said that her husband Rehman died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE) 

Aamna poses for a photograph in Bhopal November 13, 2014. Aamna said that her husband Ali died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE) 

Ram Chandra poses for a photograph in Bhopal November 15, 2014. Chandra said that his wife Prema died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE) 

Lata Bai poses for a photograph with her four sons in Bhopal November 12, 2014. Bai said that her husband Badgujjar died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE) 

Bhoori Bi poses for a photograph in Bhopal November 12, 2014. Bi said that her daughter Chandni died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE) 

Bhoori Bi (R) poses for a picture with her daughter Chandni in an undated family photograph in Bhopal. Bi said that Chandni died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE) 

A sticker is seen next to a panel in the control room of the abandoned former Union Carbide Corp pesticide plant in Bhopal November 14, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE TPX IMAGES OF THE DAY)

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A panel displays pictures of residents who died in the 1984 Bhopal disaster at the forensic department of a hospital in Bhopal November 14, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. Thirty years on, the toxic legacy of this factory lives on, say human rights groups, as thousands of tonnes of hazardous waste remains buried underground . REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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People wait to receive medicine at a clinic supported by Bhopal Medical Appeal for people affected by the 1984 Bhopal gas disaster in Bhopal November 14, 2014. 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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People wait to receive medicine at a clinic supported by Bhopal Medical Appeal for people affected by the 1984 Bhopal gas disaster in Bhopal November 14, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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Sixty-four-year-old Zafar Ahmed, receives treatment at a clinic supported by Bhopal Medical Appeal in Bhopal November 14, 2014. The rehabilitation centre only treats families they believe have been affected by the Union Carbide gas leak 30 years ago. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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A boy receives treatment 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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A girl who suffers from hearing and speech disorders reacts to the camera 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 DISASTER BUSINESS INDUSTRIAL AGRICULTURE TPX IMAGES OF THE DAY)

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In a combination picture Lata Bai (top right) is seen with her husband Ashok Badgujjar and their four sons in an undated family photograph (top) and (bottom) Lata Bai (top right) is seen with her four sons in Bhopal November 12, 2014. Bai said that Badgujjar died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE TPX IMAGES OF THE DAY)

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A combination picture shows Aamna (R) with her husband Munawar Ali in an undated family photograph (top) and (bottom) Aamna alone in Bhopal November 13, 2014. Aamna said that Ali died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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A combination picture shows Ram Chandra (L) with his wife Prema in an undated family photograph (top) and (bottom) Ram Chandra alone in Bhopal November 15, 2014. Chandra said that Prema died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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A combination picture shows Bhoori Bi (R) with her daughter Chandni in an undated family photograph (top) and (bottom) Bhoori Bi alone in Bhopal November 12, 2014. Bi said that Chandni died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH SOCIETY DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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A combination picture shows Zubeida (R) with her husband Salim Rehman in an undated family photograph (top), and (bottom) Zubeida Bi alone in Bhopal on November 11, 2014. Bi said that Rehman died as a result of gas poisoning after the 1984 Bhopal disaster. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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Eight-year-old Abhi, who suffers from mental and physical disabilities, plays outside his house at a slum in Bhopal November 15, 2014. Abhi receives treatment at a rehabilitation centre supported by Bhopal Medical Appeal which 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 DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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Former maintenance worker, Mohammed Yaqub, poses in his house with his old identity card from the defunct Union Carbide pesticide plant in Bhopal where he once worked November 13, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. Thirty years on, the toxic legacy of this factory lives on, say human rights groups, as thousands of tonnes of hazardous waste remains buried underground . REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE TPX IMAGES OF THE DAY)

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Fifty-five-year-old Subna Bi (C), poses for a picture outside her house next to the abandoned former Union Carbide Corp pesticide plant in Bhopal November 15, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE TPX IMAGES OF THE DAY)

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Residents sit atop a crumbling wall beside a pond near the abandoned former Union Carbide pesticide plant in Bhopal November 11, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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Children play on a field next to the abandoned former Union Carbide pesticide plant in Bhopal November 15, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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A network of pipes rust at the abandoned former Union Carbide pesticide plant in Bhopal November 14, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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General view of a neighbourhood next to the abandoned former Union Carbide pesticide plant in Bhopal November 15, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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The sun sets behind the abandoned former Union Carbide pesticide plant in Bhopal November 11, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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Trees surround a chemical tank at the abandoned former Union Carbide pesticide plant in Bhopal November 14, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: BUSINESS INDUSTRIAL ENVIRONMENT HEALTH DISASTER AGRICULTURE)

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A sign outlining emergency procedures, in the event of a gas leak, stands against a wall in the control room of the abandoned former Union Carbide pesticide plant in Bhopal November 11, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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Plants grow over a staircase at the abandoned former Union Carbide pesticide plant in Bhopal November 14, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. . REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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Thick dust covers chemical bottles in a laboratory at the abandoned former Union Carbide pesticide plant in Bhopal November 14, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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A reactor tank stands among the ruins of the abandoned former Union Carbide pesticide plant in Bhopal November 14, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE)

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Trees frame a rusting building at the abandoned former Union Carbide pesticide plant in Bhopal November 11, 2014. On the night of December 2, 1984, the factory owned by the U.S. multinational Union Carbide Corporation accidentally leaked cyanide gas into the air, killing thousands of largely poor Indians in the central city of Bhopal. REUTERS/Danish Siddiqui (INDIA - Tags: ENVIRONMENT HEALTH DISASTER BUSINESS INDUSTRIAL AGRICULTURE TPX IMAGES OF THE DAY)

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Victims of the 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, shout slogans during a protest against Dow Chemicals' sponsorship deal with the 2012 London Olympics Games, outside the residence of the acting President of the Indian Olympic Association (IOA) Vijay Kumar Malhotra, in New Delhi April 10, 2012. A boycott of the London Games because of Dow Chemical's sponsorship has not been mentioned by the IOA, the International Olympic Committee (IOC) said last month. The IOA has demanded London 2012 terminates its deal with the U.S. firm because of its links to the 1984 Bhopal gas disaster while there have been some calls for a boycott of the Games. REUTERS/Parivartan Sharma (INDIA - Tags: SPORT CIVIL UNREST) 

Meredith Alexander, former member of the Commission for a Sustainable London 2012, speaks to a reporter at the headquarters of Amnesty International in London January 25, 2012. Alexander has resigned in protest over a sponsorship deal with Dow Chemical because of the American company's ties to the Bhopal gas disaster that killed thousands in India in 1984. The Games' organisers chose Dow to make the hundreds of plastic panels that will decorate the outside of the main stadium in a contract that has angered many Indians, including current and former Olympic athletes. Picture taken January 25, 2012. REUTERS/Chris Helgren (BRITAIN - Tags: POLITICS SPORT OLYMPICS DISASTER BUSINESS) 

Meredith Alexander, former member of the Commission for a Sustainable London 2012, speaks to a reporter at the headquarters of Amnesty International in London January 25, 2012. Alexander has resigned in protest over a sponsorship deal with Dow Chemical because of the company's ties to the Bhopal gas disaster that killed thousands in India in 1984. The Games' organisers chose Dow to make the hundreds of plastic panels that will decorate the outside of the main stadium in a contract that has angered many Indians, including current and former Olympic athletes. Picture taken January 25, 2012. REUTERS/Chris Helgren (BRITAIN - Tags: POLITICS SPORT OLYMPICS DISASTER) 

Meredith Alexander, former member of the Commission for a Sustainable London 2012, speaks to a reporter at the headquarters of Amnesty International in London January 25, 2012. Alexander has resigned in protest over a sponsorship deal with Dow Chemical because of the company's ties to the Bhopal gas disaster that killed thousands in India in 1984. The Games' organisers chose Dow to make the hundreds of plastic panels that will decorate the outside of the main stadium in a contract that has angered many Indians, including current and former Olympic athletes. Picture taken January 25, 2012. REUTERS/Chris Helgren (BRITAIN - Tags: POLITICS SPORT OLYMPICS DISASTER BUSINESS) 

Meredith Alexander, former member of the Commission for a Sustainable London 2012, speaks to a reporter at the headquarters of Amnesty International in London January 25, 2012. Alexander has resigned in protest over a sponsorship deal with Dow Chemical because of the company's ties to the Bhopal gas disaster that killed thousands in India in 1984. The Games' organisers chose Dow to make the hundreds of plastic panels that will decorate the outside of the main stadium in a contract that has angered many Indians, including current and former Olympic athletes. Picture taken January 25, 2012. REUTERS/Chris Helgren (BRITAIN - Tags: POLITICS SPORT OLYMPICS DISASTER BUSINESS) 

Children of the victims of 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, celebrate during a protest after getting their memorandum signed by the prime minister's office (PMO) in New Delhi June 27, 2011. Dozens of children on Monday protested outside PMO demanding medical care, rehabilitation and poison free environment in Bhopal, a media release said. REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST DISASTER ENVIRONMENT) 

Children of the victims of 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, celebrate during a protest after getting their memorandum signed by the prime minister's office (PMO) in New Delhi June 27, 2011. Dozens of children on Monday protested outside PMO demanding medical care, rehabilitation and poison free environment in Bhopal, a media release said. REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST DISASTER ENVIRONMENT) 

Children of the victims of 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, wear bands as they attend a protest outside prime minister's office (PMO) in New Delhi June 27, 2011. Dozens of children from central Indian city of Bhopal on Monday protested outside PMO demanding medical care, rehabilitation and poison free environment, a media release said. REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST DISASTER ENVIRONMENT) 

Children of the victims of 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, stand in a queue after being stopped by the police from marching towards prime minister's office (PMO) during a protest in New Delhi June 27, 2011. Dozens of children from central Indian city of Bhopal on Monday protested outside PMO demanding medical care, rehabilitation and poison free environment, a media release said. REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST DISASTER ENVIRONMENT) 

Bhopal gas tragedy victims attend a protest organised by non-governmental organisation (NGO) 'Bhopal Group for Information and Action' in New Delhi November 8, 2010. Hundreds of victims on Monday demanded that U.S. President Barack Obama ensure U.S. chemical firm Union Carbide and its parent company Dow Chemical's accountability for the industrial catastrophe that took place in Bhopal in 1984. More than 3,500 people died in the world's worst industrial disaster after a poisonous gas spewed out of a factory in 1984. REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST POLITICS ENVIRONMENT BUSINESS) 

A Bhopal gas tragedy victim attends a protest organised by non-governmental organisation (NGO) 'Bhopal Group for Information and Action' in New Delhi November 8, 2010. Hundreds of victims on Monday demanded that U.S. President Barack Obama ensure U.S. chemical firm Union Carbide and its parent company Dow Chemical's accountability for the industrial catastrophe that took place in Bhopal in 1984. More than 3,500 people died in the world's worst industrial disaster after a poisonous gas spewed out of a factory in 1984. REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST POLITICS ENVIRONMENT BUSINESS IMAGES OF THE DAY) 

A Bhopal gas tragedy victim attends a protest organised by non-governmental organisation (NGO) 'Bhopal Group for Information and Action' in New Delhi November 8, 2010. Hundreds of victims on Monday demanded that U.S. President Barack Obama ensure U.S. chemical firm Union Carbide and its parent company Dow Chemical's accountability for the industrial catastrophe that took place in Bhopal in 1984. More than 3,500 people died in the world's worst industrial disaster after a poisonous gas spewed out of a factory in 1984. REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST POLITICS ENVIRONMENT BUSINESS) 

Police detain a victim of the 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, during a protest in New Delhi August 2, 2010. Police detained hundreds of victims at a protest after they crossed the given deadline to leave the protest spot, a police official said. The protesters demanded the government revisit its recent decisions on issues of compensation, rehabilitation of victims and take legal action against U.S. chemical firm Union Carbide and its parent company Dow Chemicals. REUTERS/Adnan Abidi (INDIA - Tags: DISASTER CIVIL UNREST POLITICS) 

Police detain victims of the 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, during a protest in New Delhi August 2, 2010. Police detained hundreds of victims at a protest after they crossed the given deadline to leave the protest spot, a police official said. The protesters demanded the government revisit its recent decisions on issues of compensation, rehabilitation of victims and take legal action against U.S. chemical firm Union Carbide and its parent company Dow Chemicals. REUTERS/Adnan Abidi (INDIA - Tags: DISASTER CIVIL UNREST POLITICS) 

Police detain a victim of the 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, during a protest in New Delhi August 2, 2010. Police detained hundreds of victims at a protest after they crossed the given deadline to leave the protest spot, a police official said. The protesters demanded the government revisit its recent decisions on issues of compensation, rehabilitation of victims and take legal action against U.S. chemical firm Union Carbide and its parent company Dow Chemicals. REUTERS/Adnan Abidi (INDIA - Tags: DISASTER CIVIL UNREST POLITICS) 

Children of the victims of 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, look out from a police bus after being detained at a protest in New Delhi August 2, 2010. Police detained hundreds of victims at a protest after they crossed the given deadline to leave the protest spot, a police official said. The protesters demanded the government revisit its recent decisions on issues of compensation, rehabilitation of victims and take legal action against U.S. chemical firm Union Carbide and its parent company Dow Chemicals. REUTERS/Adnan Abidi (INDIA - Tags: DISASTER CIVIL UNREST POLITICS) 

Police detain a victim of the 1984 Bhopal gas tragedy, a gas leak from a Union Carbide pesticide plant that killed at least 3,500 people, during a protest in New Delhi August 2, 2010. Police detained hundreds of victims at a protest after they crossed the given deadline to leave the protest spot, a police official said. The protesters demanded the government revisit its recent decisions on issues of compensation, rehabilitation of victims and take legal action against U.S. chemical firm Union Carbide and its parent company Dow Chemicals. REUTERS/Adnan Abidi (INDIA - Tags: DISASTER CIVIL UNREST POLITICS) 

Victims of the 1984 Bhopal gas tragedy, whereby a gas leak from a Union Carbide pesticide plant killed at least 3,500 people, attend a demonstration in New Delhi July 26, 2010. Hundreds of survivors of the accident took part in the protest on Monday demanding that the government revisit its recent decisions on issues of compensation, rehabilitation of victims and take legal action against U.S. chemical firm Union Carbide and its parent company Dow Chemicals, according to non-governmental organisations (NGO) "Bhopal Group for Information and Action" and "Children against Dow-Carbide". REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST DISASTER ENERGY BUSINESS) 

Victims of the 1984 Bhopal gas tragedy, whereby a gas leak from a Union Carbide pesticide plant killed at least 3,500 people, attend a demonstration in New Delhi July 26, 2010. Hundreds of survivors of the accident took part in the protest on Monday demanding that the government revisit its recent decisions on issues of compensation, rehabilitation of victims and take legal action against U.S. chemical firm Union Carbide and its parent company Dow Chemicals, according to non-governmental organisations (NGO) "Bhopal Group for Information and Action" and "Children against Dow-Carbide". REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST DISASTER ENERGY BUSINESS) 

A victim of the 1984 Bhopal gas tragedy, whereby a gas leak from a Union Carbide pesticide plant killed at least 3,500 people, holds a placard during a demonstration in New Delhi July 26, 2010. Hundreds of survivors of the accident took part in the protest on Monday demanding that the government revisit its recent decisions on issues of compensation, rehabilitation of victims and take legal action against U.S. chemical firm Union Carbide and its parent company Dow Chemicals, according to non-governmental organisations (NGO) "Bhopal Group for Information and Action" and "Children against Dow-Carbide". REUTERS/Adnan Abidi (INDIA - Tags: CIVIL UNREST DISASTER ENERGY) 

A child wearing a mask holds a banner in front of a burring mock pyre during a protest organised by Sadhbavana Adhikar Manch, a Non-Governmental Organisation, against the Bhopal gas disaster verdict in the central Indian city of Bhopal June 15, 2010. An Indian court last week sentenced seven people to two years each in prison for negligence in failing to prevent one of the world's worst industrial accidents that killed thousands of people in 1984. REUTERS/Raj Patidar (INDIA - Tags: DISASTER POLITICS CIVIL UNREST) 

Children wearing masks sit near a mock body during a protest organised by Sadhbavana Adhikar Manch, a Non-Governmental Organisation, against the Bhopal gas disaster verdict in the central Indian city of Bhopal June 15, 2010. An Indian court last week sentenced seven people to two years each in prison for negligence in failing to prevent one of the world's worst industrial accidents that killed thousands of people in 1984. REUTERS/Raj Patidar (INDIA - Tags: DISASTER POLITICS CIVIL UNREST) 

An activist from Sadhbavana Adhikar Manch, a Non-Governmental Organisation, wearing a mask holds a banner during a protest against the Bhopal gas disaster verdict in the central Indian city of Bhopal June 15, 2010. An Indian court last week sentenced seven people to two years each in prison for negligence in failing to prevent one of the world's worst industrial accidents that killed thousands of people in 1984. REUTERS/Raj Patidar (INDIA - Tags: DISASTER POLITICS CIVIL UNREST) 

Peace activists hold placards as they urge U.S. President Barack Obama for extradition of former chairman of Union Carbide Corporation Warren Anderson, during a campaign for the victims of Bhopal gas disaster in the central Indian city of Bhopal June 11, 2010. An Indian court on Monday sentenced seven people to two years each in prison for negligence in failing to prevent one of the world's worst industrial accidents that killed thousands of people in 1984. REUTERS/Raj Patidar (INDIA - Tags: CIVIL UNREST DISASTER SOCIETY) 

Peace activists hold placards as they urge U.S. President Barack Obama for extradition of former chairman of Union Carbide Corporation Warren Anderson, during a campaign for the victims of Bhopal gas disaster in the central Indian city of Bhopal June 11, 2010. An Indian court on Monday sentenced seven people to two years each in prison for negligence in failing to prevent one of the world's worst industrial accidents that killed thousands of people in 1984. REUTERS/Raj Patidar (INDIA - Tags: CIVIL UNREST DISASTER SOCIETY) 

Social activists hold candles during a protest against the Bhopal gas disaster verdict in the central Indian city of Bhopal June 10, 2010. An Indian court on Monday sentenced seven people to two years each in prison for negligence in failing to prevent one of the world's worst industrial accidents that killed thousands of people in 1984. The protesters called for the court to hand out heavier sentences. REUTERS/Raj Patidar (INDIA - Tags: CIVIL UNREST DISASTER HEALTH BUSINESS)