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The organization also sampled 25 different polycyclic aromatic hydrocarbons, organic compounds that form when oil, wood or garbage burns.

In homes we were able to test, my colleagues found elevated levels of metals and PAHs – polycyclic aromatic hydrocarbons – in the ash.

Norway's scaled back ambitions in the Arctic have pleased environmentalists who have consistently warned about the impact of drilling for hydrocarbons on both wildlife and the fragile environment of the polar region.

“Keep in mind, roughly 80% of Canada’s trade is with the United States, and a majority of that trade is in hydrocarbons. Canadians can’t escape how integrated they are with the US.”

Mr Bojo Leju also says "produced water" - water released from the ground when oil is extracted and often containing hydrocarbons and other pollutants - was not properly treated.