Yes go ahead and build the pipeline and from the map it looks like an extension of the currently existing one as well. There will always be risks of building anything and we can't do much of anything without affecting the environment in one way or another.
It doesn't take an idiot to know there are "environmental" risks with a pipe 36 inches in diameter carrying oil that far. This is why engineer's study safety factors, fatigue and failure. So they can design a pipe that will fail predictably and be able to predict and prevent a disaster. It would be a disaster if a well placed earthquake or tremor caused the pipe to rupture and a large amount of oil spilled.
There are environmental risks with producing almost everything we interact with. Computers have e-waste, polymers have chemical waste, nuclear energy has spent fuel rods. The point is to minimize the effect the waste has on the environment.
I'm not saying I'm all for using up fossil fuels. I strongly support alternative forms of energy. Right now, hydro is the leading way of producing energy with minimal waste. But hydro won't work in a car so we are looking at alternatives like bio-fuels and fuel-cells. It will be a slow transition away from fossil fuels but it will happen eventually. I support the keystone pipeline because of its short-term goals. "Short" in the sense that it will generate construction, maintenance and engineering jobs at the least.
I want to emphasize we need to not use this as an excuse to say "oh with the pipeline I won't have to care about alternative energy for 25 years". That would make us (humans) look very silly if/when Alberta runs out of oil and we are unprepared. Using oil for now is fine as long as continue to move towards other forms of energy production.
Fyi: Crude oil is used in
much more than gasoline.