PS – As the author of the above question/comment, I would like to add that (as an aside) the environmental changes which will result from the greenhouse effect and rising sea levels are likely to have severe impacts on ecosystems and communities and I am much more concerned about these impacts, than I am concerned about the impacts on property prices – but that is another discussion.  The purpose of my post was not to undermine the seriousness of global warming, but to enquire about how people see the threat of global warming impacting on property prices during the next 10-20 years.  Thanks.