Mars can't be terraformed. Not significantly with our tech level or any forseeable future tech level. 1. Mars core is cold. There is no magnetic field to defle

Mars can't be terraformed. Not significantly with our tech level or any forseeable future tech level. 1. Mars core is cold. There is no magnetic field to deflect solar wind. 2. Solar wind means no living on the surface and no surface agriculture. 3. Solar wind also means that any atmosphere we could potentially create will slowly be "blown away" (see details on Wikipedia). 4. A higher temperature will only vaporize the little water ice that remains, and those vapors will be blown away by the solar wind and be lost forever. Probably Venus could be terraformed if we could lower the temperature allowing CO2 to be trapped as limestone by microorganisms.