#99041 - 01/18/07 09:06 AM
Re: Global Warming
[Re: mindzeye]
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Novitiate
Registered: 12/08/06
Posts: 49
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whats the cause of it and how seriouse is the effects of it in the near future?
Edited by Curious1 (01/18/07 09:07 AM)
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#99043 - 01/18/07 09:25 AM
Re: Global Warming
[Re: mindzeye]
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Novitiate
Registered: 12/08/06
Posts: 49
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ok that sounds interesting... can anyone explain to me in more detail this cycle of climate change and how it relates to what the media has been publishing?
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#99046 - 01/18/07 11:17 AM
Re: Global Warming
[Re: Curious1]
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Registered: 11/11/02
Posts: 1725
Loc: Bonsall, CA
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Curious1- I won't pretend to know too much about climate change but have a look at these tables from this article that provides some good historical perspective. Quote:
Figure 1 Example of regional variations in surface air temperature for the last 1000 years, estimated from a variety of sources, including temperature-sensitive tree growth indices and written records of various kinds, largely from western Europe and eastern North America. Shown are changes in regional temperature in° C, from the baseline value for 1900. Compiled by R. S. Bradley and J. A. Eddy based on J. T. Houghton et al., Climate Change: The IPCC Assessment, Cambridge UniversityPress, Cambridge, 1990 and published in EarthQuest, vol 5, no 1, 1991.
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Figure 2 Variations in regional surface temperatures for the last 18,000 years, estimated from a variety of sources. Shown are changes in°C, from the value for 1900. Compiled by R. S. Bradley and J. A. Eddy based on J. T. Houghton et al., Climate Change: The IPCC Assessment, Cambridge University Press, Cambridge, 1990 and published in EarthQuest, vol 5, no 1, 1991.
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Figure 3 Air temperature near Antarctica for the last 150,000 years. Temperatures given are inferred from hydrogen/deuterium ratios measured in an ice core from the Antarctic Vostok station, with reference to the value for 1900. Compiled by R. S. Bradley and J. A. Eddy based on J. Jouzel et al., Nature vol 329, pp 403-408, 1987 and published in EarthQuest, vol 5, no 1, 1991.
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Figure 5 Estimate of surface temperature for the last 800,000 years, inferred from measurements of the ratio of 16O to 18O in fossil plankton that settled to the sea floor. The use of oxygen isotope ratios is based on the assumption that changes in global temperature approximately track changes in the global ice volume. Detailed studies for the last glacial maximum provide the temperature scale. Shown are changes in temperature in°C from the modern value. Based on data from J. Imbrie, J. D. Hays, D.G. Martinson, A. McIntyre, A. C. Mix, J. J. Morley, N. G. Pisias, W. L. Prell, and N. J. Shackleton, in A. Berger, J. Imbrie, J. Hays, G. Kukla, and B. Saltzman, eds., Milankovitch and Climate, Dordrecht, Reidel, pp 269-305, 1984.
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Figure 6 A schematic reconstruction (solid line) of mean global surface temperature through the last 100 million years, based on analyses of various marine and terrestrial deposits. The dashed-line extension is a prediction of future trends through the coming 400 years, based on the assumption of substantial utilization of the fossil fuel reservoir. The vertical line shows the approximate range of surface temperature in climate model predictions for a doubling of CO2 levels, at about 100 years in the future. Modified from T. J. Crowley, Journal of Climate, vol 3, pp 1282-1292, 1990.
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#99048 - 01/18/07 11:54 AM
Re: Global Warming
[Re: Curious1]
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Novitiate
Registered: 12/08/06
Posts: 49
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