President Obama rejected a presidential permit for the pipeline, citing concerns about its impact on the climate.
1. The oil sands deposit is massive — and so is the pipeline The Keystone XL would tap into the second biggest petroleum reserves on Earth. If it had been approved, it would run from Hardisty, Alberta, to Port Arthur, Texas. The $7 billion, 830,000-barrel a day project would go from Canada, through the Great Plains, crossing six states and ending in Texas. At left, an open pit mine in Fort McMurray, Alberta.Michael S. Williamson/The Washington Post