Xinhua: A UN report launched here on Thursday says few of the world’s coastal cities will be spared by climate change. In the 20th century, sea levels rose by an estimated 17 centimeters, and global mean projections for sea level rise between 1990 and 2080 range from 22 centimeters to 34 centimeters. The low elevation coastal zone — the continuous area along coastlines that is less than 10 meters above sea level — represents 2 percent of the world’s land area but contains 10 percent of its …