Having a colony of humans on Mars will be a possibility around the year 2030. During the colonization of Mars, the planet will be gradually terraformed over the course of 100 years, turning Mars into a green paradise, like Earth. Martian outposts will gradually evolve into more Terran cities as the progress of the terraforming turns carbon dioxide into oxygen, barren craters into oceans and lakes, and an extremely thin atmosphere into a blueish reddish though Earth-like sky. The soil and sand will mostly remain a red color. Formation of deserts will be prevented due to their link to global warming and fossil fuel use will also be banned on Mars. Proposals to create deserts have been blocked by the planet's legislature since its founding.