How to provide liquid water for people who immigrated to Mars?

The difference between a star and the earth is that,

There is no water on the surface, but there may be a lot of ice frozen in the permafrost below the surface.

There is a lot of dry ice (carbon dioxide) at the poles of Mars.

The air is thin and the greenhouse effect is weak, so that the temperature difference is too large.

Although it can reach 5 degrees Celsius near the equator during the day, it is only-100 degrees Celsius at night. There is no oxygen.

Gravity is one third of that of the earth.

Of course, the first thing is to build a space station, which should start in the second half of this century.

By the end of this century, there may be100000 Martian immigrants engaged in the Mars transformation plan.

The first step is to raise the temperature of Mars.

Establish a chlorofluorocarbon factory to produce and discharge chlorofluorocarbons in large quantities.

CFCs are not new, are they? They will aggravate the greenhouse effect.

It is estimated that the temperature of Mars will rise by an average of 20 degrees Celsius, which will take 50 years.

When the temperature rises by 20 degrees, the dry ice at the poles of Mars will melt into carbon dioxide and be discharged into the atmosphere.

This will further increase the high temperature and aggravate the greenhouse effect.

This step is estimated to take 20-30 years, which can keep the equatorial temperature of Mars at 5- 15 degrees.

After the temperature rises, the ice in the permafrost below the surface will melt into water and flow out of the surface to form rivers and lakes.

At this time, Mars will be as blue as the earth, it will rain, and it will no longer be a red planet covered with sand.

The second step is to make oxygen.

Just as oxygen on the earth is produced by living things,

We put a large number of plants capable of photosynthesis on Mars (blue-green algae is the most efficient).

They will use sunlight to release nourishing qi,

This step will take about 400 years. (I don't think I can see it)

The only thing that can't be solved is gravity, so the evolution of Martian immigrants should be different from that of the earth.

Martians no longer need strong bones to support their bodies, nor do they need strong hearts to transport blood.

In the future, a kind of "Martian" like ET may really be formed, with a big head and a thin body.

Maybe intelligence will develop faster than human beings, (in a million years, maybe they will look at human beings like monkeys)

ps。

Martians will gasp when they come to the earth, and their hearts can't bear the gravity of the earth. They are very fragile.

People on earth go to Mars like gorillas shopping, with developed limbs and slow brains.