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 its

Except D

Explanation:

Limiting animal populations in some regions has little effect on combating environmental problems. Big animals farms do cause huge environmental footprint but this problem is not resolved by limiting the animal population. Only man-made problems contribute to global warming and all the environmental problems stem from them.

Encouraging the use of public transport, enacting clean water policies and requiring emissions testing are all effective measures to combat environmental problems, the biggest issue with them is to convince people to follow the government's guidance and make them aware of the danger of ignoring the environmental issues.

its b i googled it wish u luck