I want to know the answer to the following question:
what countries is the Commission for Environmental Cooperation made up of?
All the background I'm provided with is that "The Great Plains ecoregion includes five sub-regions: Temperate Prairies, West-Central Semi-Arid Prairies, South-Central Semi-Arid Prairies, Texas Louisiana Coastal Plains, and Tamaulipus-Texas Semi-Arid Plain, which overlap or expand upon other Great Plains designations.". Is that enough to answer the question?