In the 1990s Richard B. Alley and his colleagues made headlines with the discovery that the last ice age came to an abrupt end over a period of only three years. In The Two-Mile Time Machine, Alley tells the fascinating history of global climate changes as revealed by reading the annual rings of ice from cores drilled in Greenland. He explains that humans have experienced an unusually temperate climate compared to the wild fluctuations that characterized most of prehistory. He warns that our comfortable environment could come to an end in a matter of years and tells us what we need to know in order to understand and perhaps overcome climate changes in the future. In a new preface, the author weighs in on whether our understanding of global climate change has altered in the years since the book was first published, what the latest research tells us, and what he is working on next.

Latest Edition: Introductory Economics (4th Edition)This textbook is carefully designed to provide the reader with a good understanding of the fundamental concepts of economics. The writing is lucid and at the student's level. There are twenty-nine “one-concept” chapters. Each chapter is suitably short, highlighting one economic principle. The student can study one concept and be reinforced by the learning process before proceeding to another chapter. Self review exercises conclude each chapter. The one-concept chapters also provide organizational flexibility for the instructor. The text is well integrated to show the relationship among the basic concepts and to offer a comprehensive overview of economics. There are six modules: The Economic Problem; Price Determination; Behind the Supply Curve; Level of Income; Money; and Trade.

A beautiful gift edition of the number one New York Times bestseller—from the founder and president of the Children's Defense Fund.