Your structure could be somewhere along the lines of : Paragraph1: introduction Paragraph 2: reason #1 Paragraph 3: 2nd reason Paragraph 4: counter claim Paragraph 5: conclusion You could have 7 paragraphs by adding a rebuttal and a 3rd reason or have 6 paragraphs by having a 3rd reason or by having the rebuttal
I believe you can list the problems with the suv and how it harms to environment and compare it to something else that actually helps our environment to support your answer. Also maybe include evidence from articles and papers.