I dunno about using the Castles as tankers. I don't see it speeding up the process that much - it'd probably make more sense to go the Big Spin, then go with Drak's idea of using space elevators as fountainheads. It still leaves the problem of getting the CO2 moving fast enough and going far enough that it doesn't just fall back onto the planet, but with enough spokes a combination bucket brigade/radiator elevator would work.
I still like the idea of freezing the CO2 and going for the Crystal Milennium goo, though. It provides such an interesting visual of the finished landscape. And deBeers would go totally apeshit at the idea of Venus, the Diamond Planet. %)---
Mr. Fnord
http://fnord.sandwich.net/
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Mr. Fnord interdimensional man of mystery
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"I. Drink. Your. NERDRAGE!"
I still like the idea of freezing the CO2 and going for the Crystal Milennium goo, though. It provides such an interesting visual of the finished landscape. And deBeers would go totally apeshit at the idea of Venus, the Diamond Planet. %)---
Mr. Fnord
http://fnord.sandwich.net/
http://www.jihad.net/
Mr. Fnord interdimensional man of mystery
FenWiki - Your One-Stop Shop for Fenspace Information
"I. Drink. Your. NERDRAGE!"