Wet Mars?

"What if instead of dust and rocks, our planetary neighbor Mars were a bit more lush? What if it had oceans, an Earth-like atmosphere, and green life coating its land? These are the questions Kevin Gill, a software engineer living in New Hampshire, sought to answer with his project, A Living Mars." -
Rebecca Rosen of The Atlantic reports on the project undertaken to imagine this transformation. Present day Mars here:

 "For example," Gill explains, "I didn't see much green taking hold within the area of Olympus Mons and the surrounding volcanoes, both due to the volcanic activity and the proximity to the equator (thus a more tropical climate). For these desert-like areas I mostly used textures taken from the Sahara in Africa and some of Australia. Likewise, as the terrain gets higher or lower in latitude I added darker flora along with tundra and glacial ice. These northern and southern areas textures are largely taken from around northern Russia. Tropical and subtropical greens were based on the rainforests of South America and Africa."