Occidental Petroleum, for example, is involved in a major human rights and environmental contamination lawsuit regarding the pollution of indigenous land and the Amazon River.

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"The area is very big, very heavy contamination, lots of human resources are needed, definitely machinery is needed, " he said.

BBC: 'One year' to clean toxic spill in Hungary

Gaza's only fresh source of water is too dangerous to drink because of contamination by fertiliser and human waste, a new report says.

BBC: Gaza water too contaminated to drink, say charities

Although the rice strain is now deregulated by the U.S. Department of Agriculture, it was not approved for human consumption at the time of the contamination, according to complaints that began popping up in December 2006.

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The hormone was prepared from human pituitary glands recovered from cadavers, and the absence of rigorous collection guidelines and purification procedures permitted contamination of the formulated drug with the agent that causes Creutzfeldt-Jacob disease, the human equivalent of "mad-cow disease, " or bovine spongiform encephalopathy (BSE).

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