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One of the more ambitious ideas knocking around Davos this week comes from former US Vice President Al Gore, former Mexican President Felipe Calderon and the Global Commission on Economy and Climate. The $90 trillion proposal is based on anticipated infrastructure costs and a plan to persuade mayors—all the mayors on earth—to use their infrastructure budgets to completely redesign their cities to be more sustainable in the future by increasing density and eliminating cars.  http://www.citymetric.com/transport/al-gore-thinks-we-should-spend-90trn-designing-cars-out-cities-673