Building Keystone XL would result in massive amounts of petroleum coke (petcoke), a toxic byproduct of refining heavy oil. In it’s projected lifetime, Keystone XL would result in enough petcoke to fill the Empire State Building 80 times over. For more climate movement news, follow 350 on Twitter, Facebook, Instagram ► Help 350.org build a powerful climate movement. We believe in a safe climate and a better future — a just, prosperous, and equitable world built with the power of ordinary people. Help us get there! $10 $35 $50 $100 $350 Choose a different amount