By the year 2050 about 70% of the world's population of 10 billion people will be living in cities, according to the United Nations.
원문출처 : http://www.cnn.com/2016/07/20/asia/water-cities-jason-pomeroy/index.html
원문출처 : http://www.cnn.com/2016/07/20/asia/water-cities-jason-pomeroy/index.html