From: gordond	Date: le 01 février 2006 09:55 (UTC)		(Lien)

I thought this was awesome.

http://www.green-trust.org/2000/biofuel/yohn/default.htm

	From: sap71186	Date: le 02 février 2006 17:58 (UTC)		(Lien)

In general, ethanol isn't really viable. Commercial agriculture in the US relies heavily on oil and oil resources, and therefore the net energy yeild is negative (more is consumed/utilized than produced).

However, there are ways of converting waste-oil into usable fuel, but again, that takes energy to make energy. Though, in this case, it's more productive.

With regards to solar energy, if people can see beyond the photovoltaic cells (which, admittedly, help but need to be developed more), there are ways of using solar energy productively.