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An additional point: construction-related CO2 emissions come mostly from the manufacture of cement and steel. There is research into a significant reduction of both. From what I remember, at least steel production is possible in a system closed from the viewpoint of the carbon cycle (i.e. without burning coal).

However, you can't make air travel carbon-free, however you tax it.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Tue Nov 9th, 2010 at 04:39:16 PM EST
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