Obama’s approval should be conditional on Canada enforcing serious environmental safeguards. Many bitumen companies claim that they already abide by such safeguards; but environmentalists’ skepticism is justified.
要求加拿大认真执行环保措施应当是奥巴马批准管道建设计划的先决条件。很多沥青公司称已经执行相关保护措施；但环保主义者的怀疑是有道理的。竞争迫使所有公司压低成本。只有健全的法规、透明的环境和严厉的处罚能够造就公平的赛场。