It seems like many people forget or overlook the fact that this pipeline ultimately isn't about the economic benefits (which are significant), but energy. Energy that is required to produce and deliver food, water, and all the other necessities of life, not to mention all of the niceties that we enjoy. Alternative energy sources should be developed, but for now oil and gas are still desperately needed to meet the demand.
From the US's perspective I don't see how it makes more sense to import from the Middle East or South America than us, when we have a more stable political environment and a much stricter regulatory environment.
As for crossing the aquifer, there are admittedly risks involved with that, but this pipeline will be built to the highest quality standards. The bigger concern for the aquifer, though, is the 20,000+ miles of pipeline that already run across it. That's not to say there's not a risk involved with a potential spill on KXL, but the real question is whether the risk involved is outweighed by the benefit of a secure, friendly, long-term energy supply. Given the steps that will be taken to minimize the risks (not just over the aquifer, but along the whole line), I think the pipeline should go ahead.
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