Equinox

the long version

"A delicate balance exists between humankind on Earth and the Coronians, the descendants of terrestrial scientists who were marooned aboard the space station Equinox. In exchange for raw materials crucial to expanding their off-world home, the Coronians provide precious space-based solar power to an Earth obscured by greenhouse gasses. But distrust runs deep between the two races, with each yearning for freedom from their mutual dependence yet both terrified of perishing without the other's help."--Back cover.