进入 2 1世纪 ,环境恶化问题已成为人类发展的最大障碍。水资源严重枯竭、土壤沙漠化、沙尘暴肆虐、臭氧层空洞扩大、旱涝灾害加剧、物种减少……这些已严重威胁着全人类的生存。“我们唯一的家园———地球 ,将要毁灭在我们自己手里 !”尽管环保人士发出了震聋发聩的警世之音 Entering the 21st century, environmental degradation has become the biggest obstacle to human development. The serious depletion of water resources, the desertification of the soil, the raging sand storms, the widening of the ozone layer, the increase in droughts and floods, and the reduction of species have seriously threatened the survival of all humanity. “Our only home, the Earth, is about to be destroyed in our own hands!” Although environmentalists sent out a shocking and alarming sound