After studying past climate change and the nature of the earths climate system for

Chapter 19, Problem 3

(choose chapter or problem)

After studying past climate change and the nature of the earths climate system for almost three decades, what two general conclusions did most of the worlds climate scientists agree on about atmospheric warming over the past 30 years? How did scientists arrive at these two general conclusions, and why was this such a rare event? How do scientists use models to make projections about future temperature changes? What do a number of climate models project about temperature changes during this century? How can positive feedback loops affect future temperature changes and thus global climate? Give two examples of such loops. Describe the roles that climate scientist James Hansen has played in improving our understanding of climate and projected climate disruption. Describe the contribution of waste heat from energy-conversion devices to projected climate disruption.