Kim Stanley Robinson - I read the whole trilogy from Red to Green to Blue Mars. Red Mars was excellent, as long as it kept to the idea of how to make Mars a planet where people could live. Green Mars was difficult for me to read because there was so much biological information I did not understand. Blue Mars was more about how much further humankind was taking us, including the ability to live for 200 years and more. The one theme I found in the complete series was that humankind takes its inability to work together as a whole. There were always the arguments, debates, unwillingness to see all sides of every story. On the whole, it appears that humankind will never be able to get along, even into the far future. I think that is a legitimate quarrel to make, but I also find it disheartening to know.