人们对于由人类活动引起的温室气体辐射给气候所带来的威胁是不无担忧的。人们太容易回忆起在对年代以前，气象机构根本否认在几十年和几百年的时间尺度上气候的反复多变。本世纪许多年以来，大气科学家把气候学看成是一门相当乏味的簿记练习，但大气的研究却改变了一门边缘的 It is not without concern that the threat posed by the greenhouse gases radiated by human activities poses to the climate. It is too easy to recall that until the turn of the millennium the meteorological agency had simply denied the ever-changing climate over the decades and centuries-old time scales. For many years this century, atmospheric scientists have regarded climatology as a rather tedious bookkeeping exercise, but the study of the atmosphere has changed a marginal