The disagreement is over whether warming temperatures are an issue and whether human activitiy is a cause of such warming and changing our behaviours will have an impact.
Correct, and I don't think either side can say one way or the other who is 100% correct. There is data that does suggest we are helping to accelerate the process of warming. There is data that suggest we cannot possibly make an impact on something as complicated as the world's climate.
Regardless, I prefer to hedge against risk. The consequences of a significant increase in global average temperatures is also not certain. Maybe it won't be so bad.
However, I am certain what life is like now with our current climate and enjoy it the way it is. Therefore I'm going to reduce the risk that I might be a part of the problem regardless of what the media or scientist say. It is very logical that we have some kind of impact on the environment we live in, positive or negative, no one knows for certain but a little common sense can generally guide us. No one had problems eliminating CFCs once it was proven the Ozone layer had a hole in it as a result. Since this is the only home I have, I'll do my best to make as minimal an impact as I can.