Terraforming Mars:   
Some people have suggested that we might be able to carry out  planet-wide engineering of Mars that would cause its climate to warm and  its atmosphere to thicken. This type of planet engineering is called  terraforming, because its objective is to make a planet more Earth-like  and easier for humans to live on. Discuss possible ways to terraform  Mars, at least in principle. Do any of these ideas seem practical? Does  it seem like a good idea? Defend your opinion. 

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