Associated Press: President Barack Obama’s remarks Thursday on Canada’s polluting oil sands industry and an agreement to begin a clean-energy dialogue between the countries has reassured Canadians worried the new U.S. president would restrict oil imports. Industry officials estimate the oil sands in northern Alberta could yield as much as 175 billion barrels of oil, making Canada second only to Saudi Arabia in crude oil reserves. But the extraction process produces a high amount of the greenhouse gases …