Describe global warming and cooling over the past900,000 years and during the last

Chapter 19, Problem 2

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Describe global warming and cooling over the past900,000 years and during the last century. How do scientistsget information about past temperatures andclimates? What is the greenhouse effect and why is it soimportant to life on the earth? What is the scientific consensusabout global temperature change during the lasthalf of the 20th century and about projected temperaturechanges during this century?

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