Poorly-regulated economic development is a much bigger problem for China's environment than population growth. Their fertility rate is around 1.5 and their population will peak in the next decade: http://www.economist.com/node/21553056. By 2050, China will be smaller than it is today, but if economic development continues will generate a lot more pollution and use a lot more energy.
In any case, India has managed to bring its population growth under control without resorting to such barbarism. Indeed, by 2050, India will only grow moderately more than the U.S. if current fertility trends hold. What's far more concerning is increases in India and China's per-capita resource and energy use, which could easily triple or quadruple their total numbers even with zero population growth.
In any case, India has managed to bring its population growth under control without resorting to such barbarism. Indeed, by 2050, India will only grow moderately more than the U.S. if current fertility trends hold. What's far more concerning is increases in India and China's per-capita resource and energy use, which could easily triple or quadruple their total numbers even with zero population growth.