DA you wrote:

"CO2 levels can not increase without an affect."

In some ways carbon dioxide is a sideline. Levels of other things we are putting into the air pose just as big a threat. Not necessarily through global warming. Some control over the amount of stuff we put into the atmosphere is probably the ultimate goal. I tend to agree with what someone said in England. The exaggerated scenarios often used to illustrate GW have the potential to re-enforce many people's mistrust of science. So be careful DA.