From: Raving on
[Quoting The Register]

Carbon Trust: Rooftop windmills are eco own-goal

"Not only would rooftop turbines in built-up areas be an enormous
money-pit (barring crippling electricity price rises), they would also
be bad for the environment. More greenhouse gas would be emitted
during their manufacture, shipping, installation and maintenance than
would be saved at power stations. The Carbon Trust people considered
the case of the SWIFT turbine, a representative model. ...

So an urban rooftop windmill normally produces well under 2 per cent
of the energy requirements of an average UK household*, represents an
enormous financial loss, and will normally increase the world's
greenhouse gas emissions rather than reducing them. So you'd have to
be mad to install one.

In fact, no you wouldn't - because the government will give you money
or tax breaks for a roof turbine. Even though it's usually expensive
and actually bad for the environment, thanks to the various kinds of
eco-subsidies (particularly those built into the low- and zero-carbon
buildings regs) it may make sound financial sense to buy a
windmill. ...

http://www.theregister.co.uk/2008/08/07/rooftop_wind_turbines_eco_own_goal/page2.html

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Maybe the Brits can import their wind turbines from China?

Better yet! ... How soon before people start going after owning their
own wind farm in the country, for their weekend and summer getaways.

Cutting down trees to improve wind exposure ...
Weekly drives to the friendly green homestead to get away from a
hectic week's work.
Forcing sharecroppers off their land to create eco-friendly hot spots.

The fun and games have only begun.