As the number of private cars has increased, so too has the level of pollution in many cities. What can be done to tackle this increasingly common problem?

Topic 1: As the number of private cars has increased, so too has the level of pollution in many cities. What can be done to tackle this increasingly common problem?
 

Follow these guidelines:
Introduction

There must be the thesis statement in which the subtopics are listed.

Body
Each paragraph in the body must contain its topic sentence. The ideas discussed in this part of the essay should match the subtopics / subdivisions in the thesis statement.
Conclusion
There must be the summary / restatement, or paraphrasing of the main ideas presented in the body.