The following, is a paragraph from a very interesting contribution on the subject by Professor Lisa Jardine, a contributor to BBC Radio Four's Point of View.
"We cannot afford ourselves the luxury of waiting for evidence which clinches the theory. We are going to have to learn how to participate in debates which are not about certainties. We have to decide right now whether we should sacrifice our right to cut-price air travel in order to cut carbon emissions. A public understanding of science has never been more important". http://news.bbc.co.uk/1/hi/magazine/4950876.stm