The mega cities of the developing world are expected to experience increasing rates of growth in the coming decades. The growth in population will be a challenge, but so will be dealing with the increase in air pollution.
"According to the World Resources Institute (WRI), urban populations in the developing world are growing at 3.5 percent per year, compared to less than 1 percent growth rates in developed world cities."
"UN-Habitat says that a staggering 95 percent of the expected global population growth we will see over the next 2 decades will be absorbed by cities in the developing world."
"What that means is by 2030 another 2 billion people from the developing world will be living in cities (only 100 million from the developed world meanwhile will be doing the same). Currently 75 percent of world's poorest people -- 1 billion -- live in cities."
"When it comes to poor cities, bigger is by no means always better. According to UN Habitat, the mega-cities of the future, (those with more than 10 million residents) will be "giant potential flood and disaster traps" if insufficient action is taken on behalf of their residents."
"Already, 75 percent of the world's 21 mega-cities are based in the developing world, and by some estimates, 27 of the 33 mega-cities expected to exist by 2015 will be in developing countries."
"Rapid economic growth brings substantial problems of its own -- notably increased pollution. Already, 16 of the 20 most polluted cities in the world are in China, which is arguably undergoing the most rapid industrial and economic transformation the world has ever seen."