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1.What caused concentrations of CO2 to decline during cold glacial periods in the Pleistocene?
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2.Scientists say that changes in Earth’s snow and ice cover are both a cause and consequence of changes in climate.Explain what they mean.
3.What molecules absorb infrared light, but water vapor is not believed to contribute to global warming. Why not?
4.In what ways does deforestation contribute to the increase in greenhouse gases in the atmosphere?
5.What is responsible for the seasonal changes in CO2 concentrations observed in data from the Mauna Loa Observatory?
6.The melting of continental glaciers causes sea level to rise, but the melting of Arctic sea ice does not. Why is this so?
7.Global warming is having a significant effect on populations of many plant and animal species.Describe three ways in which this is occurring.
