clear-cutting (deforestation) 滥砍滥伐
desertification 沙漠化
shortage of fresh water 淡水短缺
white pollute 白色污染
environmental pollution 环境污染
over-fishing (overgrazing) 过度捕捞 (过度放牧)
sand storm 沙尘暴
resource exhaustion 资源枯竭
sustainable development 可持续发展
ecosystem 生态系统
water and soil conservation 水土保持
disruption of ecological balance 生态失衡
natural preservation zone 自然保护区
conserve natural resources 保护自然资源
