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Chapter 20 Climate Change and Ozone Depletion 1 Chapter Overview Questions How have the earth?s temperature and climate changed in the past? How might the earth?s temperature change in the future? What factors influence the earth?s average temperature? What are some possible beneficial and harmful effects of a warmer earth? 2 Chapter Overview Questions (cont?d) How can we slow projected increases in the earth?s temperature or adapt to such changes? How have human activities depleted ozone in the stratosphere, and why should we care? 3 Core Case Study: Studying a Volcano to Understand Climate Change NASA scientist correctly predicted that the 1991 Philippines explosion would cool the average temperature of the earth by 0.5Co over a 15 month period and then return to normal by 1995.