Also , paleoclimatologists can use data from tree rings , pollen analysis and the local geology to determine the temperatures and precipitation at the time 此外,古气候学者利用年轮、花粉分析、当地地质等资料,可以确定当时的气温与雨量。
Already we pump out carbon dioxide three times as fast as the oceans and land can absorb it ; midcentury is when climatologists think global warming will really begin to bite 我们释放二氧化碳的速率已经是海洋和陆地吸收速率的三倍,气候学者认为,到了本世纪中叶,全球暖化的效应将开始反噬。