The aim of global paleoclimatic research is to reveal the natural process of past climate change, probe its mechanisms and forecast the trend of human environment in the future.

全球古气候研究目的是为了揭示过去气候变化的自然历程，探求其形成机制，预测未来人类环境走向。

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We can see past occurrences of climate change that took place over just a few hundred years.

我们可以看到过去几百年里发生的气候变化。

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Over the past decade, the focus has been on climate change—how the warming of the Earth from greenhouse gases is leading to conditions that worsen fires.

在过去的十年里，人们关注的焦点一直是气候变化，即温室气体导致的地球变暖是如何导致火灾恶化的。

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He says that in the Antarctic Peninsula, scientists estimate that climate change has caused temperatures to increase by two or three degrees Celsius over the past fifty years.

VOA: special.2009.06.03

Dr.Anond Snidvongs, who has studied climate change for more than a decade, has analyzed storm data over the past 60 years.

VOA: standard.2009.12.21

Indeed,volatile food prices, population growth, low agricultural productivity and the potentially devastating effects of climate change make it a particularly daunting challenge. The IFAD president says over the past 30 years, agricultural productivity in developing countries has been stagnant or in decline. He blames it on years of under-investment.

VOA: standard.2010.03.29

The lake is said to retain an excellent record of past climate change which can be inferred from the types and abundance of algae and other organic matter found in its bed muds.

BBC: Toba super-volcano catastrophe idea 'dismissed'

Mike was a pioneer in the study of groundwater as an archive of past climate change and his research provided seminal scientific advances on controls on water quality in regional aquifers, recharge over time and space.

UNESCO: In Memoriam: Professor W. Mike Edmunds

The once-secret lives of plants are telling researchers volumes about the composition of Earth's atmosphere, providing clues to past and current climate change.

CNN: Plants spread secrets about climate change