> Actually the idea is to have a giant (several km^2) greenhouse
> underneath, with a 1000' or so tall stack on top. The hot air
> generated in the greenhouse rises up the stack and turns a bunch
> of turbines to generate electricity.

Proposed 1000m stack in Mildura, Victoria, Australia

http://www.enviromission.com.au/index1.htm

5km diameter plastic canopy, 35degC temperature differential
between bottom and top of stack causing 15m/s airflow through
the turbines

An article in Silicon Chip 7/2002 says that a pilot scheme with a
195m stack and 240m diameter greenhouse in Manzanares, Spain
ran for 7 years from 1982-89 producing 50kW of power

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