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Because it smells bad
Ummm . . . windmills use the wind to keep them turning. No biofuels are involved.
Use as gas
source:(http://en.wikipedia.org/wiki/Biofuel)we use biofuels because they do not make as much pollution as normal fuels.
Biofuels
If they are diesel powered they can.
The main thing that keeps geothermal energy from being in widespread use is that it is not easily available everywhere. Currently geothermal energy is mainly used in places where volcanic activity and the related heat is relatively close to the surface.
There is widespread use of the internet.
Perhaps greed. Because leds cost less and last longer. Or mabye there not bright enough or to bright.
In order to grow the crops required to produce biofuels more forests need to be knocked down to make the necessary fields.
Biofuels are fuel made from any plant or animal based products. Two traditional biofuels are wood and corn. Biofuels are renewable sources of energy.
The steady increase in carbon dioxide concentrations in the atmosphere come from our use of fossil fuels. If we were able to stop using fossil fuels, the amount of carbon dioxide in the atmosphere would stop rising. Biofuels are a partial answer, because by using biofuels you are reducing our use of fossil fuels.