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YANG Nan, 17, was happy to move to her new home in a northern area of Beijing. She was told that her neighborhood used to be farmland planted with vegetables, corn and wheat.But looking at the new road, beautiful park and supermarkets, Yang couldn't see any sign that food was once grown there.

Yang is not alone. In recent years, many Chinese people have moved into new houses in country areas. Tall buildings have been built everywhere in the suburbs. The crops and fruit trees are no more. But these changes have caused problems too, warns Gan Zang chun, an official (官员) at the Ministry of Land and Resources (国土资源部).

"Chinese cities are growing fast. This has made the area for farmland much smaller. This is really bad for the country's ability to grow food, not to mention the lives of farmers," said Gan last Monday.

The country needs farmland to grow food for the people of China. But the recent rise in house prices has made selling land a good business. A lot of land has been used to build new houses for sale.