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1 Introduction
Pages 3-4

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From page 3...
... Human activity has contributed to increased atmospheric concentrations of CO2, CH4, and CFCs. The increased atmospheric concentrations of greenhouse gases may increase average global temperatures.
From page 4...
... Increases in atmospheric greenhouse gas concentrations probably will be followed by increases in average atmospheric temperature. We cannot predict how rapidly these changes will occur, how intense they will be for any given atmospheric concentration, or, in particular, what regional changes in temperature, precipitation, wind speed, and frost occurrence can be expected.


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