In more than three billion years, that is. Cause of the habitable zone will go to Mars.
If we didn't terraform it yet, the ice will melt on the surface and turn into water, making the land green.
But I suspect that we will terraform it before Earth's ocean will evaporate.
The melting ice will only create blue seas, nothing else.
We need life before we can live. Water is not equal to life. There could be two ways of getting life there:
Placing primitive one-celled organisms (if they can even be called cells) that probably started life on Earth, in fatty acids on Mars, if Mars has... I think volcanoes are needed, at least sea streams from warm to cold water.
Or placing many of the animals in our own eco-system. We may not need every single bacteria, but placing many of the big animals may also bring many of the bacteriae that life on them with them.
But then we also need to place many plants.
While this may not take billions of years to evolve, I think this is the best option. I see a problem with the gravity and the diffrent environment, it may be hard for Earth animals and take some time to evolve into it. Perhaps killing many of the animals we place?