Hill: The Keystone XL pipeline will expand oil sands production in Canada by 36 percent, and therefore, ramp up carbon emissions, according to a report released Thursday by environmental groups. The groups said the report gives President Obama all of the information he needs to reject Keystone, as the president said in June hed oppose the Canada-to-Texas pipeline if it significantly exacerbates carbon pollution. The answer to the presidents Keystone XL climate challenge is clear: the Keystone...