I haven’t studied this in detail, but my dim understanding is that the objection is to potential environmental impacts to the Ogallala Aquifer (that’s the official objection — we all know that the eco-loons real problem with it is that they hate fossil fuels). So why not propose starting the pipeline at the two ends now, at the Canadian border and in Houston, work toward the center, and defer the final routing of that section until they’ve studied it more? If they refuse to do this, we’ll have put the lie to their objection and showed their real agenda.