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Politics : The Environmentalist Thread -- Ignore unavailable to you. Want to Upgrade?

To: Triffin who wrote (21018)	3/26/2008 8:52:01 PM
From: neolib	Respond to of 36921

Surely you are not serious? Both Mars which is further from the Sun, and Venus which is nearer than earth could have climates similar to ours if they had atmospheres close to ours. Of course neither does, Mars has a VERY sparse atmosphere, and Venus a VERY dense one. In both cases, their climate is FAR more determined by their atmosphere than by their orbital distance from the Sun. BTW, if Venus did have an atmospheric density like ours, it would have another problem which is it would need to spin faster. It's solar day is about 1/2 its solar year, which oddly enough does not cook one side and freeze the other in its current high atmospheric density, but it would be a problem with an atmosphere like ours. Mars of course rotates about the same speed as the earth (25-26hr day??) If Venus rotated at about the same speed as the earth, then it would need an atmosphere which was a little less GHGee than earths given its location to the Sun, while Mars would need a bit stronger GHG atmosphere all else being equal, which it is not either. I don't know the relative contribution of interior heat making its way to either planet's surface, which is the other thing to consider. You'd need to assume you could cool Venus down to start with, not just give it a reasonable atmosphere.