The us and canadian governments are doing all of the following to combat environmental problems except a. encouraging the use of public transportation b. enacting clean water policies c. requiring emissions testing d. limiting animal populations in some regions

D. limiting animal populations in some regions

Explanation:

In order to battle the pollution and save the environment, the governments of these two countries have Canada and the United States, are both countries that are highly developed, thus they are also highly industrialized countries. Having lot of industry, strong economy which needs to go forward, and population that consumes a lot, unfortunately leads to large scale pollution have undertaken several measures.

The public has been constantly encouraged to use public transportation, to recycle the waste, or to not throw garbage out on the open.

Enacting clean water policies has also been a big measure, as it has directly battled the water pollution, be it by the industry or by the individuals, which is crucial considering that the freshwater is the most precious resources.

The industry has also been forced and required to make testings about the emissions, and also limit them to a certain point, so that both the industry can run, but to not cause heavy damage tothe environment as well.