How do you talk to somebody about global warming and religon?

In talking with a lot of people about global warming it seams that people dont want to talk about the science or statistics that disagree with them, its like talking to somebody about religion. What I seem to notice is that peoples thoughts about GW are locked in and its pointless to talk to them( arguing at a brick wall comes to mind). Any idea on how to talk to people and accualy change their mind.