ea of a sustainable city is not out of reach and in some cases have been truned into a reality. Now, more than ever before, city governments in alls parts of the world are seeing the need to plan their policies and the use of the land under

Many cities are also worried about the availability of future water sources. In Bangkok, the capital of Thailand, six million inhabitanats draw their water from a natural underground storage area known as an aquifer. The results is land subsidence ( a downwards settling of the land) and a potential shorage of water. Mexico city, which is residents to about 20 million people, has sank by more than 7 meters between 1940 and 1985. This sinkage was in large part due to the excessive pumping of water from the hundreds of wells located just below the surface of the city. The city consumes at least 60,000 liters of water per second; 80% of this supply is from groundwater. Another problem for cities is water contamination originating from industrial or agricultural wastes as well as human excrement. In Karachi, Pakistan, only 70 percent of necessary water is provided by the city. Those who cannot afford are force to drink from untreated supplies often contaminated with diseas!

It is not only desirable, but practical to make the the transition from fossil fuels to more effiecnet and less polluted sources of energy. Reducing today?s wasteful and inefficient consumption of fossil fuels is only half the equation to be considered in building a sustainable city. The other half involves producing a cheap, reliable and renewable source of energy. Solar energy which has been around for decades is now being seriously considered as possible energy source. It is sustainable, non-pollutanted and rapidly becoming cheaper with the help of new technologies. China, for exmaple has built 12 solar photovoltaic (PV) factories with a capacity totalling 4.5 megawatts. Other renewable sources of energy are wind, tides, and the internal heat of the earth (called geothermal energy). The idea of wind energy was seriously consider in the 1970s when the oil ciris hit. It was not followed up on the because of the ineffeicny of windmills. Since then with inventions of n!

Conventional economics has been ignoring the fact that the atmosphere is a basic resource, essential to life and livelihoods. Pushed by the need to stabilize the city climate, and pulled by investment opportunities, global energy markets are beginning a move to more efficient and cleaner systems. Among the expected changes are a new generation of lightweight and super-efficient electric cars, rapid conversion of coal and nuclear plants to efficient gas turbines, a new generation of mass-produced wind and solar generators that are cost competitive with the fossil fuel plants. For exmaple, the new energy-saving homes of Schiedam in the Netherlands are knocking as much as 90% off the average price of heating a home. In these homes, central heating is not even needed, because the water heater alone provides all the warmth. A pump pulls freash air into the house and warms it up with the old stale air it is ejecting. Milton Keynes, an small town in England is also implimentin!

Air pollution is a serious problem which occurs in almost all of the world?s largest cities

Some common words found in the essay are:
Reducing Pollution, Mexico City, Water Supply, CONCLUSION Human, Latin America, Burndtland Commision, Environmental Policies, Sustainability Conventional, Sustainable Wind, , sustainable city, mexico city, sources energy, air pollution, renewable sources energy, quality life, renewable sources, developing world, quality index, developing world cities, policies protect, air quality index, air water, idea wind energy,
Approximate Word count = 2051
Approximate Pages = 8 (250 words per page double spaced)