Suing US govt. because of NAFTA? Good luck with that. You cannot force any country to buy your product. One of the provisions (Environment) is good enough to reject the XL pipeline. We do not need XL pipeline except the GOPs to satisfy their puppet master Koch brothers. Actually I heard other companies that had sued Canada.
Environment
Securing U.S. congressional approval for NAFTA would have been impossible without addressing public concerns about NAFTA’s environmental impact. The Clinton administration negotiated a side agreement on the environment with Canada and Mexico, the North American Agreement on Environmental Cooperation (NAAEC), which led to the creation of the Commission for Environmental Cooperation (CEC) in 1994. To alleviate concerns that NAFTA, the first regional trade agreement between a developing country and two developed countries, would have negative environmental impacts, the CEC was given a mandate to conduct ongoing ex post environmental assessment of NAFTA.[13]
In response to this mandate, the CEC created a framework for conducting environmental analysis of NAFTA, one of the first ex post frameworks for the environmental assessment of trade liberalization. The framework was designed to produce a focused and systematic body of evidence with respect to the initial hypotheses about NAFTA and the environment, such as the concern that NAFTA would create a "race to the bottom" in environmental regulation among the three countries, or the hope that NAFTA would pressure governments to increase their environmental protection mechanisms.[14] The CEC has held four symposia using this framework to evaluate the environmental impacts of NAFTA and has commissioned 47 papers on this subject. In keeping with the CEC’s overall strategy of transparency and public involvement, the CEC commissioned these papers from leading independent experts.[15]