The Long Thaw is refreshingly free of political overtones, although it attempts to address the thorny issue of what climate change means to humans. The author does this by looking into what the past climate held for the earth, as our planet essentially flip-flopped between very cold and very warm (we have been living in an unprecedented stable period of temperate climate for the last 10,000 years or so).
Lots and lots of science here, but none too daunting, that go into detail on how natural warming and cooling occur, with descriptions of sunspot activities, cyclical orbital changes, ocean mixing behavior, volcanic activity, and yes, carbon dioxide levels. Because the author takes such a long view in the past (and future), he avoids most of the current politicization of global warming discussion. He clearly states that cyclical warming is natural and expected, but then makes a good case that our current warming is likely to be almost completely human-made, as we should be entering a new ice age.
The Long Thaw is quite original in its discussion on important aspects of climate change. It does not re-hash IPCC reports, or discuss alternate energy sources. It doesn't even really scare the reader into thinking climate change is bad - it just points out certain facts, such as an inevitable rise in sea level if carbon dioxide emissions continue along a business-as-usual path.
A few things I learned from the book:
Carbon dioxide remains in the atmosphere, on average, a few hundred years, but some remains for thousands of years.
Very small changes in solar energy input or carbon dioxide levels can lead to very great changes in climate.
Carbon dioxide does not always cause global warming initially, but always makes it worse due to positive feedback cycles. (The warmer it gets, more CO2 is produced, and the more CO2 that is in the air, the warmer it gets.)
We can probably burn all the existing oil and natural gas without causing dangerous warming of the planet, but coal is ten times more abundant than oil and natural gas combined, and if we burn all the coal, the planet will most likely become extremely hot, with sea level rises of 30 feet and displacement of ten percent of the world's population. Sea level rise could be as great as 150 feet, flooding large parts of where people live.
Global warming naturally occurs throughout geological history. The difference this time is that warming appears to be occurring largely due to human burning of fossil fuels, and the change is more rapid than natural. Slow climate change can be adapted to, but it is not known if human societies have the ability to adapt to rapid climate change.
The cost to avoid dangerous climate interference is very small if we act now. Because carbon dioxide emission costs are currently not paid for (they are externalized to everyone, not just the producer), there is no incentive to reduce emissions.
A very well-written book, heavy on science and facts (as currently understood), and almost devoid of politics and alternate energy discussions.
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