How are the united states and canada cooperating to improve environmental conditions?

The two federal governments have implemented over 40 international agreements for the management and protection of environmental quality and ecosystems in the border area and there are over 100 additional such agreements between U.S. states and Canadian provinces. The two countries also share policies, programs, and goals to prevent and control pollution and to ensure sound policies and practices to protect and restore the many shared ecosystems.

Hope this helps!

The answer i think is d