“The world is building more cities, faster than ever before. China used more cement in the last three years than the United States used in the entire 20th century. By 2050, India will need new urban infrastructure to house an additional 404 million people — a task comparable to building every city in the United States in just 35 years. The global urban population is expected to rise to well over six billion by 2050 from 3.9 billion today.”