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The book is aimed at those who know little about climatology or global warming. It will help to have some general scientific background. The pertinent facts - how much we have increased the atmosphere's CO2 concentration, in what way this gas effects the earth's energy balance, etc. - are available here, and the information is referenced to primary scientific sources. The prognosis for a warming of the atmosphere is gently asserted in the affirmative, but the uncertainties are also presented. Without being a climatologist, I found most of my qestions of this nature were answered. The only point I was curious about but found missing was what recent changes in glaciers tell us about the present tendency of global temperature.
After presenting the data, the models and arguing gently for a moderate warming tendency, Houghton presents several nice chapters on effects (potentially severe) and responses to the problem, with a particular emphasis on energy. The suggested responses leave one with the sense that Houghton is an optimist. He incites to action, where it is hard to imagine today's politicians asking us to change our habits so fundamentally.
This book is stimulating, both on the subject of global warming (whether or not it is occurring, how much, what is our role), as well as on the potential consequences and suitable responses. Considering that a response is advisable - a point of view which Houghton advances - one is left with a sense of the large scale of the responses which are necessary to reverse the accumulation of CO2: is mankind's ability to improvise its way out of a fix capable of dealing with a problem whose solution would require changes of this magnitude?