1.The first Martians will have water when they have melted the ice.
2.The first Martians will have a warm planet when they have planted gigantic mirrors around it.
3.The first Martians will have oxygen when they have grown algae.
4.The first Martians will be sure of constant oxygen supply when they have planted trees.
5.The first Martians and other animals will be able to start a new life when they have produced an agricultural programme.