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A new energy concept called a solar tower could generate enough electricity for 200,000 homes. Looking like a giant smokestack, it would release no noxious fumes ? just sun-heated air. Demonstrated more than 20 years ago, the basic design calls for solar collectors to warm the air near Earth’s surface and then channel it up the tall central tower.
On a sunny day, the air at the top of the tower would be 70 degrees Fahrenheit (20 degrees Celsius), whereas the air in the greenhouse could reach 160 degrees Fahrenheit (70 degrees Celsius). As this hot air escapes up the tower at…










