Pollution is now one of the world's biggest problems, especially in developing countries, such as China. The economic growth may be to blame. With the rapid economic growth, China is now the second largest economy in the world, and at the same time pollution, a byproduct of the development, has accompanied the growth to come. People are now so familiar with the environmental pollution, such as air or water pollution - the sky is no longer blue; the rivers aren't clear any more.
Beijing, the capit