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