Why Is Line 5 A Problem?

Line 5 is an oil pipeline that transports several tens of millions of gallons of oil every day. It is dangerously close to rupturing which would release a large amount of oil into the Great Lakes. This oil would turn the lakes black and kill all wildlife. It was rated to be in use for 50 years when it was installed. but we are going on 64 years of use. This is the problem.