Canada’s pro-business Conservative government and environmentalists are squaring off again.
The latest skirmish follows the release of an Environment Canada list updated earlier this month of an 363 harmful chemicals going into Canadian air, land and water.

The list did not include toxic chemicals used in fracking, and the omission has environmentalists steamed.
Fracking is one of the drugs of choice for the oil industry. The process extracts otherwise inaccessible oil and gas by fracturing rocks with high-pressure injections of water and other compounds.
A recent U.S. study found that 750 different chemicals are used in process. It said at least 29 of them are considered toxic or carcinogenic.
Three environmental groups had asked Environment Canada to include fracking chemicals on the updated list. The agency decided that such chemicals are not used regularly enough, or in large enough quantities, to be inventoried.
Environmentalists fear the possible cumulative effects of fracking, including the poisoning of local water supplied. They maintain that while fracking isn’t continuous at any one wellsite, that doesn’t mean releases aren’t continuous.
Critics say if the government does not know exactly which chemicals are being used for fracking, it is impossible to assess the risk that may be posed by those chemicals.

They point to a recent study by the Canadian Council of A cademes for support. The study, released in April, concluded that the silence around such additives is a major roadblock in understanding the environmental impact of fracking
Environment Canada says it is studying the report and adds the inventory was never intended to be an exhaustive list of pollutants.
Perhaps surprisingly, disclosure of fracking chemicals is supported by the Canadian Association of Petroleum Producers.
Two provinces, Alberta and British Columbia, already require disclosure but exempt substances considered trade secrets.
Joseph Castrilli is a lawyer with the Canadian Environmental Law Association. I spoke with by phone from his office in Toronto.
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