It depends, what is your opinion? If you are against it, I know for a fact that Water Vapor is the main Greenhouse Gas, so as my Meteorology teacher says, focusing on Carbon Dioxide and global warming is like focusing on how one single nut or bolt acts in a car crash.
If you think Carbon Dioxide has a great effect on global warming, find some specific things that increase global warming as a result of carbon dioxide..
If there is some other position you have, try again to make connections, like three major things that could decrease global warming are this this and this.
Hope that kinda helps!
On a side note, since I don't know your opinion, keep in mind that the same computer models they are using to predict the end of polar bears, etc., are the same computer models they used about 40-60(not sure) years ago to predict that right now we would be having an ice age, which technically we are, but they meant a full blown out ice age!