滥垦草原

滥垦草原、盲目移民的结果是草原生态环境遭到严重破坏而沙化退化；

Because of abusive cultivation of grassland and unplanned immigration , the ecological environment of grassland has been deteriorating and the process of desertification is accelerated .

事实上，沙尘暴形成的主要原因是过度放牧及滥垦草原，这表明沙尘暴大多是人的活动所导致，也就是说，它们是可加以控制的。

It is a fact that excessive herding of animals and exploitation of grasslands are responsible for the majority of dust storms . This means that dust storms are largely a result of human actions ; in other words , they are controllable .