China has only 7% world arable land.
China must feed over 20% world population.
Result of a mountainous topography in China:
China is mineral rich but arable land scarce
(only 10.5% of total land area is cropland
compared to 20% in USA)
我是這方麵專家。給美國大學生教過中國地理。以上直接拷貝自我的講課PPT。