duttorm are becoming a great concern for both the public and the government in recent year. every pring overwhelming and and dut weep the northern part of china, blocking out the ky, enhrouding citie and village, bring much inconvenience and problem to people＇ live and work. in ome region, andtorm have caued great lo in both people＇ live and propertie.
duttorm are largely created by man himelf. on the one hand, too much air pollution caue a greenhoue effect, which, in turn, lead to global wanning in climate. thi reult in wet place on the earth even wetter and dry place even drier. on the other hand, over grazing, poor fanning, tree cutting, trip mining all leave theland unprotected. when the wind blow, it blow away topoil and looe oil.
duttorm are another punihment nature give to mankind. we mut be alert to thi ecological alarm. we hould not only take effective meaure to top duttorm but alo draw ome leon from it. we hould not "develop" the local economy at the cot of the natural environment.