Abstract
The study on global changes is an important international scientific program of IGBP organized by ICSU. It is also one of the most active programs in the area of natural sciences.Obviously, the study of global climate change in the past should be a focus of the modern scientific research. Its first task is to reconstruct historical sequences of climate. The research is not only the basis of knowing the climatic change in the past, but also the key to predict the climatic change trend in the coming 21st century. In the past two years, we have carried out some preliminary study of environmental magnetism by systematical sampling of modern sediments at a section in the Kunming Lake in the Sum-
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