Alex Steffen: The shareable future of cities Alex Steffen,  a long time climate change campaigner, journalist and founder of online magazine www.worldchanging.com recently gave an inspiring talk at www.ted.com which I wanted to share with you here. Steffen explains that in the developed world, our response to climate change has focused largely on a transition from fossil fuels to renewable energy which he says is a recipe for disaster. Not because renewable energy is a bad idea, but because the trajectory of emissions growth posed by a rapidly urbanising world is likely to outstrip any capacity...


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