"This is a highly readable account of the nature of ice ages throughout earth's history and the evolution of their scientific understanding since the introduction of the term by Louis Agassiz in the 1830s. The shifts in opinion on the merits of the various explanations of ice ages traced by Macdougall make fascinating reading."--Roger Barry, Director, National Snow and Ice Data Center

"Frozen Earth is a thorough and compelling account of the history of ice on earth and of the scientists who uncovered the extraordinary role that ice ages have played in shaping our world."--Gabrielle Walker, author of Snowball Earth

"A fascinating and important read."--Jack Repcheck, author of The Man Who Found Time

"Macdougall takes us on a fascinating journey through the realm of ice age science. He deciphers some of the basic mysteries of the bitter climatic regimes that have gripped the earth in the past and will probably grip it again in the future. This engrossing book has important lessons for anyone concerned with global warming and future climatic change."--Brian Fagan, author of The Little Ice Age