Step 1: mirrors at the poles melt ice caps to release oxygen. step 2: permanent base. step 3: colony, and specially bred plants help the atmos. people need lighter suits due to more air pressure. step 4: people can go outside without spacesuits, but still need breathing masks. mars is almost earth. step 5: mars is as close to earth conditions as it can get. no masks or spacesuits. TREES Key: Red Mars (mars suit) Green Mars (lighter suit) Blue Mars (no suit) Mars terraforming plan acording to a book I have