Christian Science Monitor: Climate scientists meeting in Copenhagen Tuesday warned that sea levels could rise to almost three times that of the official worst-case estimates, threatening hundreds of millions of people. The landmark 2007 report by the United Nations Intergovernmental Panel on Climate Change predicted that sea levels would rise 18 to 59 centimeters – about 7 to 23 inches – by the end of the century. That would be enough to submerge several small island nations, and would inundate low-lying and …