Assessing the Impact of NAFTA on Environmental Law and Management Processes

The document analyzes the intersection of trade law and environmental management, arguing that while trade rules are not inherently inconsistent with environmental protection, they impose significant technical and capacity burdens on governments. It highlights a high risk that older environmental measures may fail trade law challenges due to retroactive application and a lack of original trade-law consideration. The author specifically warns that NAFTA Chapter 11 investment rules pose a more severe risk because they allow private corporations to initiate arbitration and have been interpreted expansively to include 'covert or incidental interference' as expropriation, potentially creating a chilling effect on new environmental legislation.

• Trade law has evolved into a 'constitutional' structure for governments because it defines what states 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 being found inconsistent with trade law if challenged, as trade requirements were generally not considered during their creation.
• The risk of actual trade challenges to older measures is mitigated by the fact that such challenges must be initiated by other governments, creating a political constraint.
• New environmental measures face a 'hidden' risk because governments often lack the combined technical, scientific, and legal expertise required to meet cumulative trade disciplines while achieving environmental goals.
• There is a potential conflict between pollution prevention strategies—which focus on product life-cycle and source redesign—and the trade law requirement to use the 'least trade restrictive' measure.
• NAFTA Chapter 11 investment rules pose significant risks to environmental law-making because they allow private corporations to initiate arbitration and have been interpreted to protect investors from 'covert or incidental interference'.
• The Metalclad v. Mexico ruling is particularly concerning as it ignored sustainable development and environmental protection objectives, focusing instead on transparency and predictable commercial frameworks.
• The expansive interpretation of expropriation under Chapter 11 may effectively end the 'police powers' doctrine, potentially requiring governments to compensate polluters for environmental regulations that interfere with profit.

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} }