Heres an interesting statistic... To power the world, if it was operating at full capacity all the time, you would need to cover an area nearly the size of Texas with solar panels
The thing is... can enough power be created by wind and solar to make them useful? Im from ireland and i no that about 4 reactors would be enough to power my entire country whereas it would take about 1000 windmills i reckon... and thats only if they were running at optimum capacity all the time.
That really is the stumbling block with me for wind power. Unlike fossil fuel or nuclear power you cant simply turn up the power...