I cant remember the exact number, but the long term jobs created from this pipeline (as in those that don't go away after it's finished) is around 50. Which isn't really the jobs boon supporters claim it is. And, as far as its environmental impact, I think the concern is more about spilling, than it is how the transported oil is used. Oil companies have terrible track records with spills, whether its from pipelines or rigs, it happens all the time. Considering the president is trying to move the country towards renewable energy, it never made any sense to approve this pipeline. I'm just surprised it took him so long to reject it.