https://books.google.com.hk/books?id=o2CBBnB44YMC&pg=PR23&dq=Chinese+Research+Perspectives+on+the+Environment+volume2&hl=en&sa=X&ved=0CC0Q6AEwA2oVChMI7eLC6uHdxwIVx2qOCh0nLA27#v=onepage&q=Chinese%20Research%20Perspectives%20on%20the%20Environment%20volume2&f=false

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