Communications expert George Marshall offers six strategies for talking to people who don’t accept that climate change is happening Drawing on his workshops in climate communications and the latest social research he proposes a respectful approach that responds to their interests and values. He says that you should keep away from an argument about the science and concentrate on the personal journey that led you to accept the problem.
http://climatedenial.org/2012/03/29/how-to-talk-to-a-climate-change-denier-dissenter/