Writers : Review of Keystone XL pipeline information shows it 's not in the national interest . They say tar sands oil spews 17 % more natural gas than crude oil refined in the U.S . Writers : Oil from tar sands spews 17 % more greenhouse gas than the average crude oil refined in the United States . EPA acknowledges tar sand oil from Keystone could worsen climate change . Oil companies will need even more pipelines to reach their customers , they say .
Writers : Review of Keystone XL pipeline information shows it 's not in the national interest . They say tar sands oil spews 17 % more natural gas than crude oil refined in the U.S . Writers : EPA acknowledges tar sand oil from Keystone could worsen climate change . Oil companies will need even more pipelines to reach their customers , they say .