Aug 3 2011: This has been a great conversation about cities and the sustainability challenge. I wonder, though, with the debt crises in the US (arguably more of a political rather than an economic issue) as well as the ones in Europe, where will the money come from to finance all of these sustainability efforts. Are citizens willing to pay extra taxes/ fees to live in sustainable cities? If yes, how much and for how long? I feel that this would be a major obstacle in realizing many novel transportation and energy ideas.
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