Approximately how long should each phase of a terraforming project take, eventually culminating in a habitatable earthlike envirnoment?

When peoples go to Mars, must they stay on Red planet or can comes back to Earth?

In the 1990s Kim Stanley Robinson wrote "Red Mars," the first of a trilogy of novels exploring human terraforming of Mars. In one scene, a red haired young man of Slavic descent orchestrates the catastrophic loss of pressure in the dome protecting the first Martian town. Do you think that this character casting by Robinson is offensive to Slavic peoples? Does this deed, done by a colonist harboring personal enmity toward some of his colleagues, show that human beings are not yet emotionally mature enough to attempt settlement of Mars?

If we ever settled on mars,will the human settlement will be for natural human civilization or for mining purposes?

If humans settled on Mars, wouldn't we pose a great risk towards destroying the planet, as we are currently doing so on Earth (climate change, over consumption of resources, etc.)?

What areas on Mars are best suited for human settlement?

Will ever humans settle on Mars; and enjoy red mars with Earthly atmosphere?

If we put human colonies on Mars, would a feud break out between Mars people and Earth people?