I was having my daily look at news sites, and the BBC has a rather amusing, if not unexpected (given their usual environmental doom and gloom babbling) article on micro-renewable wind turbines.
In short, it says what most people with even a slight engineering / scientific background have suspected for a long time. Mini turbines to stick on your house are crap and do not work.
The equation to tell you how much power you get out of one of these turbines involved the cube of the wind speed - which means you need a gale force wind to generate any useful electricity from the mini turbine, and in a moderate breeze, you get approximately fuck all.
How can this possibly be "green"? It would seem this is yet another case of people hyping a technology they don't understand hoping the shroud of the environMENTAL religion will shield them from the real world.