The Ecotopia 2121 Project details the futures of thousands of cities across the globe as though they've somehow overcome all the grave environmental challenges our age and grown to become super-Green and super-ecofriendly. This month, we highlight the future of Phnom Penh, the capital of Cambodia. One of the persistent challenges for the South East Asian cities on the Mekong River, like Phnom Penh, is flooding. These floods can be seasonal or episodic. In future Phnom Penh,