A Meeting With Medusa/Green Mars

A Meeting with Medusa – Arthur C. Clarke
Taking place partly on Earth and partly in the atmosphere of Jupiter, the story tells of Howard Falcon, the captain of a new and experimental giant-sized helium-filled airship. When an accident causes the ship to crash, Falcon is badly injured and takes over a year to fully recover.

Green Mars – Kim Stanley Robinson
Nearly a generation has passed since the first pioneers landed, but the transformation of Mars to an Earthlike planet has just begun The plan is opposed by those determined to preserve the planets hostile, barren beauty. Led by rebels like Peter Clayborne, these young people are the first generation of children born on Mars. They will be joined by original settlers Maya Toitovna, Simon Frasier, and Sax Russell. Against this cosmic backdrop, passions, rivalries, and friendships explode in a story as spectacular as the planet itself.