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.
事實(shí)上,沙塵暴形成的主要原因是過度放牧及濫墾草原,這表明沙塵暴大多是人的活動(dòng)所導(dǎo)致,也就是說,它們是可加以控制的。