How can we change the entire atmosphere and terrain of Mars?
The fact that we are affecting the climate of the Earth is a sort of proof that we can affect the climate of Mars. The same greenhouse effect that people are trying to avoid on Earth is exactly what we want on Mars. If the humans living on Mars were to set up factories for the purpose of producing greenhouse gasses, in 20 to 30 years they would warm the planet up 10 degrees Celsius. If you warm up the planet 10 Celsius [18 degrees Fahrenheit], massive amounts of carbon dioxide, which permeates the Martian soil, would start to outgas. Carbon dioxide is also a greenhouse gas, so it would warm the planet further another 40 degrees Celsius [72 degrees Fahrenheit]. And the atmosphere would thicken quite a bit. Water would start to melt out of soil. In the tropical regions of Mars you would have water flowing once again in the dry streams. You would have rain, and plants could grow outside on Mars.
