Explain extensive agriculture and intensive agriculture.

Liberating agriculture means sacrificing the environment to gain benefits, with less investment, low efficiency and unsustainable. The scientific and technological content of extensive agriculture is very low, and the output depends on the size of land area, natural fertility of soil and weather. For example, in the arid desert areas of Africa, in the arid or cold areas such as Inner Mongolia, Qinghai and Tibet in China, and in remote mountainous areas such as Yunnan and Guizhou, intensive agriculture is a specialized, large-scale and market-oriented agriculture that increases the output of agricultural products by applying advanced agricultural technical measures and adopting mechanized and intensive farming, as in the United States. Try to make the land exert its maximum potential, concentrate manpower and material resources, and maximize benefits.