The worsening natural environment and the double crisis confronting human beings urged him to probe for a way to reestablish a harmonious relation between men and nature and he never retreated.

• 自然环境的日益恶化,人类生存面临的双重危机,更坚定了他重建人与自然和谐关系的决心,从此便踏上了探索的不归之路。