The dry weather of the Northwest China is a background factor of ecological environment change, we shouldn't neglect it.
当然西北地区的干旱气候是环境变迁的背景因素，我们不应忽视它。
That water is the key factor of ecological environment being changed was demonstrated by citing a great deal of materials.
引用大量事实比较全面的阐述了引起生态环境变化的关键因素是水。
The water is the foundational natural resource and the strategic economical resources, and it is the essential factor of ecological environment.
水是基础性的自然资源和战略性的经济资源，是生态环境的控制性要素。
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