Using data from more than500 weather stations in China, American researchers found the amount of sunlight hitting the ground has fallen by3.7 watts per square yard in each of the last five decades amid a nine-fold increase in fossil fuel emissions.

• 利用中国500多家气象台采集的资料，美国研究人员发现到达地面的日光量在过去的五十年中每十年下降每平方码3.；7瓦，与此同时，矿物燃料的排放量却增加了九倍。