Whether or not the world faces ruinous warming, debate over the issue of climate change has taken a welcome turn toward reason.The Royalty Society of London, which describes itself as a "fellowship of the world's most eminent scientists," has retreated from its former advocacy for "urgent steps to cut greenhouse gas emissions into the atmosphere, as much and as fast as possible, to reduce the more severe aspects of climate change."That position appeared in a June 2007 document responding point by point to arguments made by "those who seek to distort and undermine the science of climate change and deny the seriousness of the potential consequences of global warming...