Calderon and Gore made their presentation at the World Economic Forum in Davos, Switzerland where, ironically (or maybe not, at this point), some 1,700 private jets — which use petroleum — were used to shuttle in conference participants and others to discuss global warming and other pressing global issues.

Former Vice President Al Gore and former Mexican President Felipe Calderon are pushing for $90 trillion in spending to ban cars from every major city in the world and make them more dense.

Gore and Calderon presented a report from the Global Commission on the Economy & Climate (GCEC) and argued that fighting global warming will require making cities more compact and wholly reliant on public transit. This is the only way to make sure urban areas don’t contribute to global warming, the two politicians argued.

Calderon and Gore argued that $90 trillion is going to be spent anyways in the coming decades upgrading cities around the world. They argue that it should be spent on making cities more climate friendly.

“The mistake we made in Mexico was to let cities develop however they want, and it’s a mess,” Calderon told Business Insider.

GCEC’s study says that “more compact, better-connected cities with strong mass transit systems will help policy-makers tackle these pressing challenges. Such cities are more productive, socially inclusive, resilient, cleaner, quieter and safer.”

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