Assessing the Impact of NAFTA on Environmental Law and Management Processes

This research paper analyzes how trade and investment disciplines under NAFTA and the WTO impact the ability of governments to enact and implement environmental laws. The author argues that while there is no inherent conflict between trade rules and environmental protection, the cumulative and retroactive nature of these disciplines creates significant legal and capacity risks for governments, particularly regarding older measures and the expansive interpretations of investment protections in NAFTA Chapter 11.

• Trade law has evolved into a 'constitutional' structure for governments because it defines what they can and cannot do, provides binding mandatory adjudication, and includes a sanctioning process through financial penalties or tariff adjustments.
• Most existing environmental measures adopted between the 1970s and early 1990s are at high risk of failing trade law challenges because they were developed without considering the independent and cumulative disciplines now required by NAFTA and the WTO.
• The risk of challenges to older measures is mitigated by the fact that such cases must be initiated by governments, and under WTO processes, there is an opportunity to rectify failures and revise measures rather than automatically withdrawing them.
• New environmental measures face a 'hidden' risk where they may be stalled or weakened during the policy-making process due to a lack of human and technical capacity to integrate both environmental and trade law requirements.
• There is a potential conflict between pollution prevention strategies—which focus on product life-cycle and source redesign—and the trade law requirement to apply the 'least trade restrictive' measure.
• NAFTA Chapter 11 investment rules pose a more severe risk than general trade rules because they can be initiated by private corporations and have been interpreted expansively by arbitral panels.
• The Metalclad v. Mexico ruling established a concerning precedent by defining expropriation to include 'covert or incidental interference with the use of property' and stating that the government's motivation for the measure is irrelevant.
• The expansive interpretation of Chapter 11 may effectively end the 'police powers' doctrine, potentially requiring governments to compensate polluters if environmental laws interfere with an investment's profit generation.

APA

Mann, H. (2000). Assessing the Impact of NAFTA on Environmental Law and Management Processes. International Institute for Sustainable Development. https://www.iisd.org/system/files/publications/trade_mann_final.pdf

Chicago

Mann, Howard. Assessing the Impact of NAFTA on Environmental Law and Management Processes. International Institute for Sustainable Development, 2000. https://www.iisd.org/system/files/publications/trade_mann_final.pdf.

Wikipedia

{{cite report |last1=Mann |first1=Howard |title=Assessing the Impact of NAFTA on Environmental Law and Management Processes |publisher=International Institute for Sustainable Development |date=October 2000 |url=https://www.iisd.org/system/files/publications/trade_mann_final.pdf |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{mann2000assessing, author = {Mann, Howard}, title = {{Assessing the Impact of NAFTA on Environmental Law and Management Processes}}, institution = {International Institute for Sustainable Development}, year = {2000}, month = oct, url = {https://www.iisd.org/system/files/publications/trade_mann_final.pdf}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }