The Steps of the Sun by Walter Tevis
From the bestselling author of The Queen's Gambit, a dramatic science fiction odyssey in which a billionaire ventures into outer space to save Earth
The year is 2063. Earth's energy resources are dangerously close to being depleted, a new world superpower has upset America's global dominance, and the threat of a new Ice Age looms large. Fortunately, there is one man brave enough--and perhaps foolish enough--to venture beyond the planet to find the mineral resources that will secure the country's future: Ben Belson. One of the richest men in the world, Belson is haunted by personal demons and wanted for his unlawful space travel, but he will stop at nothing to fulfill his crucial mission--and discover a future greater than he could ever have imagined.