Withglobalwarmingand的精选

问题详情：阅读下面短文，根据其内容写一篇60词左右的内容概要。   Withglobalwarmingandmeltingice,itisn’teasybeingapolarbearanymore.Somestudieshavepredictedthatpolarbearscoulddieoutbytheendofthecentury.Th...