EDITORIAL

摘要

Happy New Year to AMA readers around the world. The 20~th century was over and after the beginning of the 21st century, 20 years has already passed. During the past century, the world suffered various wars, handled severe conflicts and struggled with food shortages, but the world's population has been steadily increasing toward 10 billion people. However, the extend of agricultural land in the world has not increased. So the agricultural land per capita in the world continues to decrease. The divide between rich and poor in the world continues to be widen. In such condition, stress is mounting high and tougher competition for resources leads to major conflicts.