Condition: Acceptable. Please see the images for more details. There’s residue in the inside boards from a former library book life.
Blurb: "Only a few know the terrifying truth--an outcast Earth scientist, a rebellious alien inhabitant of a dying planet, a lunar-born human intuitionist who senses the imminent annihilation of the Sun. They know the truth--but who will listen? They have foreseen the cost of abundant energy--but who will believe? These few beings, human and alien, hold the key to the Earth's survival."
1972 Nebula Winner
1973 Hugo Winner
1973 Locus SF Winner