Danny, it's true that temperature cycles have naturally varied on the Earth. However this one is different, It started naturally enough but this time the temperature rise cannot be explained by natural causes.
Unfortunately there are a lot of media types who jump on any misleading argument and oddball scientist and love to build a "Global Warming Hoax" story.
We'd all love that, we could all stop worrying and go on burning fossil fuels.
The Royal Society have a nice page with all these misleading arguments here:
http://royalsociety.org/page.asp?tip=1&id=6230
Your one is "Misleading argument 1"
There is a lot of research going on and windfarms are becoming big. The UK will shortly become the biggest off-shore wind generating nation in the world.
Trouble is you can't rely on wind to blow and the sun to shine exactly when you need energy. It's usefull but it can't be the only solution. That's why nuclear is big news right now.
In the long term though nuclear fusion will probably be the answer but building a little star on Earth isn't easy, it's been done but it will be about 30-40 years before the first commercial one is built
http://www.iter.org