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- W2389944759 abstract "In geological history,the earth′s climate changed regularly and constantly and the concentration of atmospheric CO2 also changed over time,so scientists argue whether there were response-feedback effects between them.In this paper,global climate change is assumed to be a multiple time-scale change,various time scales including long time orbital-scale,thousand year time-scale and nearly hundred years are introduced and analyzed.For long time-scale,both average global temperature and atmospheric CO2 level present a reduction trend.Many times during geological history,atmospheric CO2 level rose,sometimes to as high as ten times of the present level.It is found that the high CO2 level period was not always corresponding to the high temperature period.For thousand year time-scale,it is found that warm periods emerged at all global continents,for instance,the temperature in medieval period was even higher than that of today.During the past one hundred year,the average global temperature rose by 0.74 ℃,and there are different understandings about the reason.It is too early to say that the global warming since the industrial revolution was mainly caused by human activities.Further investigation are required." @default.
- W2389944759 created "2016-06-24" @default.
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- W2389944759 date "2012-01-01" @default.
- W2389944759 modified "2023-09-23" @default.
- W2389944759 title "Variations of Atmospheric CO_2 Concentration and Global Climate" @default.
- W2389944759 hasPublicationYear "2012" @default.
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