Which of the following is not a strategy for improving the long-term 6 of cities?
a. restoring natural ecosystems
b. reducing pollution and waste
c. increasing automobile use
d. compact and efficient land use

The correct answer is letter C. Increasing automobile use is not a strategy for improving the long-term health of cities. Automobile use produces carbon dioxide emissions at high levels which add up to the destruction of the Earth's atmosphere. 30-40% of carbon dioxide emissions are caused by this and other human activities (e.g. factory industries, mining).

A stategy that isn't designed nor meant to improve the long-term 6 of cities would be increasing automobile use - c.

Automobiles are extermely harmful devices which have drastic effects on the environment when taken as a whole; compared to using the public transport or bicycles, or other means of transport. Because we have autos, cities aren't really aren't really up to the challenge in the long run.