The first book in the Mars series brought us into a newly settled world and made us want to be there - although maybe not having to deal with all those fascinating problems with concrete. Green Mars continues developing characters that we met in the first book and tracking the political and ecological developments of a terraforming world. Unlike much sci fi involving habitation of a new planet, Robinson takes an intelligent understanding of anthropology and social theories and applies it to a well written and engaging plot. I will admit now to reading the whole series already and enjoying almost every moment of them and yearning to see the expansive red landscapes and the gradual terraforming mutating the planet, slowly but surely. If you've read the first book(Red Mars), don't worry about the sequel letting you down. If you haven't read the first one, then read it first, or Green Mars won't make sense.