i have no clue please help!!!!

Every single wind farm in the UK is backed up 100% with real power producing technology, for example if we build a wind farm to produce power to 5 million homes we also need them 5 million homes to have a backup form of power like nuclear or real power stations.

So in truth wind turbines have not decreased co2 at all. How can we be so foolish. Who is getting rich off these subsidies?

I was wondering how much money does the world as a total spends on renewable energy?

Is there any reason they would turn off wind turbines in a wind field due to efficiency? I know the fans are braked if winds exceed a certain velocity and possibly due to energy needs they may stop some of them. However in a debate with a friend he argued that it would be more efficient and produce more energy to have fewer running versus more. This is counter intuitive can someone shead some light on this topic. I refuse to accept my friend logic.
In response to answer number two...its a wind mill u dont use energy to run it u gain...so y would u ever want them not moving or "shut them down.'' Even if u had 1 rotation per hour u'd be gaining more energy than 0 rotations. Further my friend argued that the first turbine in a row would run slower if the one behind it were running. This I know is false. And my friend has no reliable source or literature to prove his point.

I wanted to use a small wind turbine for a science experiment, but I can't find any to buy below 0, where can I find one?
I'm not allowed to just build a model.