经济压力下的农业：更多，更快，更好的基因 http://www.epa.gov/agriculture/ag101/ 农业生产效率：美国农业人口2%，中国35% 网络搜索：world Agriculture efficiency The U.S.farmer is the most productive in the history of the world. Food is more affordable in the United States than in any other developed country in the world. There is a definite trend toward fewer farms producing an increasing share of agricultural products in this country. In spite of many challenges,U.S.agriculture is uniquely positioned to provide for the food and fiber needs of a growing world community.经济压力下的农业：更多，更快，更好的基因 http://www.epa.gov/agriculture/ag101/ 农业生产效率：美国农业人口2%，中国35% 网络搜索： world Agriculture efficiency The U.S. farmer is the most productive in the history of the world. Food is more affordable in the United States than in any other developed country in the world. There is a definite trend toward fewer farms producing an increasing share of agricultural products in this country. In spite of many challenges, U.S. agriculture is uniquely positioned to provide for the food and fiber needs of a growing world community