Between 700 trillion and 10,000 trillion tons of methane hydrate, a powerful greenhouse gas, are trapped in the seafloor sediments where they've accumulated over millions of years.
经过数百万年的积累，甲烷水合物被储存在海底沉积物当中，这是一种强大的温室气体，数量介于700万亿至10000万亿吨之间。
Yan Zhao at Lanzhou University and co-workers 1 have found an alternative climate indicator for lower areas - pollen trapped in lake sediments.
兰州大学赵艳及其合作者的研究工作证明在低海拔地区，湖泊沉积物中的孢粉可以作为很好的气候指示物。
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