The Ecotopia 2121 Project details the futures of 100 cities across the globe as though they've somehow become super-ecofriendly. This month, we highlight the future utopia of Katun in the Altai Mountains of Central Asia.

This Project speculates upon the green futures of 10,000 geographically real cities and towns throughout the world. This week, we showcase Karachi in the year 2121. Karachi -- nowadays the biggest city in Pakistan -- has severe problems with the silting-up of its harbor and waterways. Transportation, and the marine environment, are both so grossly degraded by silting that they are each being brought to the point of dysfunction. The silting is a natural process, the rivers b