>>515
>Mars has only 20 Minutes more to a day than earth so plants grow fine,
This is a retarded statement.
>you can actually walk and live on the surface
In a space suit.
>it has water ice
Mixed with insane concentrations of salt.
>and it's a lot easier to warm a planet than it is to cool it.
Not really.
>>484
Teraforming wouldn't occur for at least a few hundred years. We simply don't have the technology to deliberately shape worlds (it took about a hundred years just to dump enough CO2 into the atmosphere to affect earth)
Teraforming Mars is difficult because we are trying to bring life back to a dead rock.
Major problems are:
No magnetic field. Basically you and everything else is at the mercy of the suns rays. This contributes to the loss of atmosphere and cancer. There currently is no way to start up the molten core again.
Mars receives much less sunlight. Less sunlight = less energy for plants, solar cells, heat, etc.
Low atmosphere. This is obvious.