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Refined by: ?search=&sort=-Year_iso,_score&perpage=10&page=1&&refine[Regions_and_countries_EN][]=Region+IV+-+North+America%2C+Central+America+and+the+Caribbean%24%24%24Canada&r&|||||&unrefine[Topics_EN][]=Water+pollution Water pollution ?search=&sort=-Year_iso,_score&perpage=10&page=1&&refine[Topics_EN][]=Water+pollution&r&|||||&unrefine[Regions_and_countries_EN][]=Region+IV+-+North+America%2C+Central+America+and+the+Caribbean%24%24%24Canada Region IV - North America, Central America and the Caribbean > Canada