Introduction
•general statement
•Thesis statement
Body paragraph1( Smog )
•Topic sentence
•supporting detail1
•supporting detail2
Body paragraph2 ( Acid rain )
•Topic sentence
•supporting detail1
•supporting detail2
Body Paragraph 3 ( Dioxin )
•Topic sentence
•supporting detail1
•supporting detail2
Body Paragraph 4 ( Freon gas )
•Topic sentence
•supporting detail1
•supporting detail2
Conclusion
• Restatement of thesis
• Final comment