EcoWatch: In a country reckoned to have the worst climate policies in the industrialized world, one big city is setting out to defy the central government and become 100 percent carbon neutral. Vancouver, in British Columbia, Canada, wants to establish itself as the greenest city in the world by 2020 by demonstrating that economic growth and the welfare of its citizens depends on developing renewables, rapid transit systems, and promoting cycling and walking to curb car use. It is one of dozens of cities...