According to different regions and ecological conditions, the sand hazard along the railway was divided into four types and nine grades.

因不同地带生态条件不同，引起铁路沙害可划分为四类九级。

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The main ecological environment problems in the west China are a little rain and arid, serious hazard of wind sand, topography in pieces, vast hilly gully area and intense soil and water erosion.

本文分析了晋陕蒙接壤地区资源开发中的生态环境问题，认为该地区生态环境问题主要有干旱少雨、风沙危害严重；地形破碎、沟壑纵横；水土流失面积大、侵蚀强度大。

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While some are saying that this is a harbinger of things to come, others are cautioning that such technology is not only expensive but also a potential ecological hazard.

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