Coming from me, these two should probably have amounted to expected and typical.
http://www.amazon.com/Principles-Pl...=sr_1_1?ie=UTF8&s=books&qid=1291418043&sr=8-1
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Probably too heavy for a casual read, but most of it can be followed without an in-depth mathematical degree. Too bad its often a textbook, meaning that it isn't as often read for personal interest and knowledge enhancement. His lecture series used to appear online, I haven't seen them lately, but it is worth reading for those with a desire for a more detailed understanding. Though much of this is also true of the next offering, it is a bit more casual reading "friendly."
If you want to understand the basic building blocks of planetary climate (ours and others throughout the solar system and universe) this is the primer. "The Principles of Planetary Climate" is Climate Science 101
http://www.amazon.com/Global-Carbon-Princeton-Primers-Climate/dp/0691144141/ref=pd_cp_b_2
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As alluded to above, While this book is every bit the text, it is much more readable, IMO. the focus of this work is much more on our planet's carbon cycle with respect to its short-term, intermediate term and long-term impacts upon our planet's climate, in the past, present and future.