Kim Stanley Robinson has earned a reputation as the master of Mars fiction, writing books that are scientific, sociological and, best yet, fantastic. Green Mars continues the story of humans settling the planet in a process called "terraforming." In Red Mars, the initial work in the trilogy, the first 100 scientists chosen to explore the planet disintegrated in disagreement--in part because of pressures from forces on Earth. Some of the scientists formed a loose network underground. Green Mars, which won the 1994 Hugo Award, follows the development of the underground and the problems endemic to forming a new society.