This book studies the history and gives an analysis of extreme
climate change on Earth. In order to provide a long-term
perspective, the first chapter briefly reviews some of the wild
gyrations that occurred in the Earth s climate hundreds of millions
of years ago: snowball Earth and hothouse Earth. Coming closer to
modern times, the effects of continental drift, particularly the
closing of the Isthmus of Panama are believed to have contributed
to the advent of ice ages in the past three million years. This
first chapter sets the stage for a discussion of ice ages in the
geological recent past (i.e. within the last three million years,
with an emphasis on the last few hundred thousand years).
The second chapter discusses geological evidence for ice ages
how geologists surmised their existence prior to actual subsurface
data that proved the theory. The following two chapters look at ice
cores (primarily from Greenland and Antarctica). Chapter 3
discusses how ice core data is processed and Chapter 4 summarizes
data obtained from ice cores. Chapter 5 discusses the processing of
data obtained from ocean sediments, and summarizes the results,
while the following chapter discusses data from other sources, such
as "Devil s Cave."
Chapter 7 summarizes the experimental results from Chapters 4,
5, and 6. It provides the foundation for comparison with theories
in later chapters. In a perfect world, this data would be totally
separate and disconnected from theory. Unfortunately, as the author
shows, dating of much of the data was accomplished by "tuning" to
the astronomical theory, which introduces circular reasoning.
Chapter 8 provides a brief overview of the various theories that
have been devised to "explain" the patterns of alternating ice ages
and interglacials that have occurred over the past three million
years. This serves as an introduction to the following three
chapters which presents the astronomical theory in its various
manifestations,
compare the astronomical theory with data, and then compare
other theories with data. Finally, Chapter 12 summarizes what we
think we know about ice ages and, more importantly, what we don t
know. "
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