NEW DELHI – Indian ministers called yesterday for the government to extradite the former head of Union Carbide and pursue liability claims against Dow Chemical as part of a new push for justice in a 1984 toxic gas leak that killed 15 000 people, a minister said.Anger over the world’s worst industrial disaster – at a plant owned by a Union Carbide subsidiary in central Indian city of Bhopal – was revived this month after a court convicted seven former senior employees of the company’s Indian subsidiary of “death by negligence” and sentenced them to two years in prison. (AP)