DON SMITH/STAFF PHOTOGRAPHER An air permit issued on Nov. 6 by the state Department of Environmental Protection allows Buckeye Partners to accept large amounts of Canadian tar sands oil at its newly renovated oil terminal in Perth Amboy. As debate rages in Washington over the environmental risks of allowing Canadian tar sands oil to be pumped across the U.S. in the proposed Keystone XL pipeline, the Christie administration has quietly approved a permit that essentially opens New Jersey’s rail lines to carry that kind of oil through densely populated towns, past thousands of homes and businesses. An air permit,...