Three countries working together to protect our shared environment

International collaboration between Canada, Mexico and the United States on environmental issues of common interest

In the Spotlight

Our Impact

Explore how the CEC’s work over the years has delivered tangible environmental and social outcomes across North America — from scientific studies that guided environmental standards, regulations and policies in Canada, Mexico and the United-States, to trinational conservation strategies, community grants and geospatial mapping projects. Whether you’re a policymaker, conservation expert, researcher or simply interested in North American environmental cooperation, this page offers a comprehensive overview of not only what the CEC has achieved — but how and why those efforts have unfolded.

Our Impact

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Featured Project

Strengthening Evidence-Based Collaborative Monarch Butterfly Conservation

2025 Active Ecosystems

Monarch butterfly population has experienced a significant decline over the last few decades. While the 2024-2025 wintering season saw an increase from the previous year, this remains one of the lowest recorded population sizes and highlights the ongoing challenges for monarch conservation, as well as the urgent need for coordinated,...

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Monarch Butterfly Conservation

Featured Publication

Long-term Impact Assessment of the CEC Monarch Butterfly Conservation Work (1996–2016)

March 14, 2025 2 pages Ecosystems

Since 1996, the Commission for Environmental Cooperation has been actively involved in the conservation of the monarch butterfly (Danaus plexippus), a symbol of trinational environmental cooperation between Canada, Mexico, and the United States. Although interrupted for a few years, CEC efforts to conserve the species intensified after population declines were recorded at overwintering sites in Mexico in 2005 (Rendon-Salinas and Galindo-Leal 2005).

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What We Do

We conduct research, provide tools and training, and provide a unique space for decision-makers and the public to engage on environmental policy issues affecting the North American region.