From the Times: 

Having spent £13,000 on installing a wind turbine at his home, John Large is disappointed at the return on his investment, which amounts to 9p a week.

At this rate, it is calculated, it will take 2,768 years for the electricity generated by the turbine to pay for itself, by which time he will be past caring about global warming.

Don't you love it when environmentalists put their money where their mouths are?