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If anything, the book is a mosaic of the tools scientists use to try and study earth's climate. However, what one takes away from this book is that we really don't know how it works -we just have good ideas. The final chapters are laden with comments about how we have no idea what the future holds in terms of climate. This detracts from the earlier discussion since it seems like we have no reason to believe Alley.
The analogies used in this book are also quite poor. Please give your readers some credit. The analogies are so dummed down that they are outright ridiculous. They would be appropriate for a 10-year old (or younger).
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In part two of the text, the author lucidly describes the rationale behind the selection of ice and of Greenland as an "archival" source. He discusses the methods in and problems of obtaining and preserving the material intact and uncontaminated and the methods of analysis that produced the data. Throughout the following chapters, he lays out for the reader the thinking that went into its interpretation and how this information can be used as a paradigm with which future outcomes of climate change might be predicted. Because Alley, a professor of geoscience at Penn State, took an actual part in all of these proceedings and is an active scientist himself, he is well positioned to give an informative account of the topic. He also has a readable writing style which many such individuals do not.
Although I felt that his attempt to "get down to" the level of his non-technical audience was sometimes a little patronizing, I did think that his explanations of some of the physical systems was very clear. The description of the events leading to and during the Younger Dryas got a little confusing with the comparison to a roller coaster with a bungee jumper and a yo-yo, but by the end of the chapter one still had a fair idea of what he was trying to convey.--I think he was just trying a little too hard. His explanations of important environmental cycles with which I was already familiar--like those of the carbon, the water, the heat distribution, the oceanic and lake water overturn, and atmospheric cycles and those of the Coriolis and Milankovich effects--were very clear. In fact they were clearer than some textbook descriptions I've read. Although I had read of the effects of fresh water on the North Atlantic "conveyor belt" and its subsequent effect on global climate, I had not encountered the Dansgaard-Oeschger cycle or the Heinrich-Bond oscillations in my reading in the past. The author's presentation was therefore of interest to me.
For most readers, part five will probably be of greatest interest. Here the author puts what is known or suspected of climatic mechanics to work in predicting possible impacts of human activity on global climate and the world's population. Here too he points out the nature of the scientific method and its limitations. He is quite clear that some of what he states in his final analysis with respect to the future is personal opinion and not science.
As an earlier reviewer points out, the book is an excellent portrayal of how science works, particularly in the aspects of framing a problem and a means of approaching it experimentally, and interpreting the data that arises therefrom. I found it a very entertaining book.
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Now, this sounds like a way to our past via the ice cores. We can measure the oxygen content of the atmosphere when the snow was laid down, we can get a sample of the dust in the snow. We can tell that the last ice age ended very abruptly, only three years, all from core samples in Greenland.
But what they found that intrigues me moreover is that the earth goes into deep freezes alternating briefly with mild conditions. Man has been keeping records of the weather for approximately 200 years and we've expierenced unusually temperate climates... what happens if we go into the deep freezer. Drilling down two miles into the ice, they found atmospheric chemiand dust the enabled then to construct a record of such phenomena as wind patterns and precipitation over the past 110,000 years.
This is a well-written book with a pleasing narrative keeping the read interested in the subject matter. It provides an excellent survey for the general reader and those interested in the history of scientific exploration.
The explaination of the discovery process in terms the general reader can understand is one of the benefits of this book. The author does this to really open up the flow of knowledge about a subject that could put readers to sleep. We need to know and understand what happened in the past to face the challenges of the future.
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Throughout this book the reader is brought onto the trail with the author and we see what a hiker's day is like as he ponders some of life's most important questions. I looked forward in each chapter to see what the hiker was going to eat for the evening meal and what the "Points to Ponder" were for the day. The "Points to Ponder" provide an action list to be focused on once the hiker returns to civilization.
The book helps the reader to reflect on life as well as view nature through the eyes of an experienced "Leather Tramp". It also allows the reader to see the Appalachian area and possibly plant a desire to hike in the same footsteps as the author. Although not the book I thought it was going to be, the story unfolded into an interesting tale.
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