Actually it is. The copper river has a natural gas pipeline on it now. It has broken many times due to Mother Nature. The pipeline is going to follow the same path. Only a matter of time till it breaks to letting all the oil into the river then down to the skeena and so on to the ocean.
And how has it "broken many times due to Mother Nature?"
Was it due to corrosion pitting? Stress Cracking Corrosion? Girth weld defect? Long seam defect?
Pipelines don't break due to mother nature, it is due mainly to time and stress on the lines in addition through inherent defects in the line itself or more commonly in the coating surrounding the line which then exposes the line to SCC and corrosion pitting.