Alright I saw a disscusion about his previosly here and I must inform the masses of several things. 1st.Global warming is a condition which occurs when there are too many gasses in the atmosphere. 2nd.Global warming will be nessecary on mars because the atmosphere is so thin and mostly made of C02 which is toxic to humans. 3rd.The oppisite is true for venus. 4th.The questions isn't whether or not it exsists but rather will humans be able to survive its effect. For somme good reading on colonization and living on mars and education read the series on Mars by Kim Stanley Robinson.
