A good read,
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This review is from: The Case for Mars: The Plan to Settle the Red Planet and Why We Must (Paperback)
An excellent introduction - if a little optimistic given the current state of technology. I like the view that we can get there for $50 billion.
However, he makes a good case for why we need to get to Mars. It is written very much from the perpective of why America needs this and is currently the only country which can get there. But even the updated version does not take account of the fact that the USA could probably not make the attempt given the financial state of that country.
The only way it will happen though is via another space race - as in the race to the Moon where money was no object. The only way that will happen is after the Chinese annex the Moon in the late 2020s.
That may wake up America but I somewhat doubt it. The Red Planet will eventually be the Yellow one.
The book is a little technical in parts but not to a degree where the average person could not follow the reasoning or understand what is being said. The tone can be somewhat 'evangelical' but he believes what he is saying so can be forgiven.