The aims of the World Summit on Sustainable Development are laudable. Cleaner air and water, better stewardship of global resources, the eradication of poverty and disease no one can argue with such objectives. The question is how to get there from here. Let me offer a prescription for sustainable development that begins with a simple and powerful idea - an idea which, unfortunately, will often be at odds with what delegates, journalists and other observers hear in Johannesburg. The idea is that economic growth leads to levels of wealth and income that, in turn, inevitably produce societies that are cleaner,...