Told entirely through fictional eye-witness accounts of living creatures both past and present, this brilliant novel is one of the most powerful and original books on climate change ever written.

As colonists begin to transform Mars into a livable, Earth-like planet, tensions erupt between those who would alter the planet into a paradise for humanity and those who wish to preserve the planet's harsh, barren beauty.

On the brink of completing the terraforming effort on Mars, colonists find their work complicated by a crisis on Earth, new colonization projects on Jupiter and Saturn, and the onset of a Martian ice age.

From the summit of their distant future, a charismatic renegade named Ganymede travels to the past to bring Galileo forward in an attempt to alter history and ensure the ascendancy of science over religion. Yet between his brief and jarring visitations to this future, Galileo must struggle against the ignorance and superstition of his own time.