biofuels have never been 'Green'
To set the record straight, Biofuels were never meant to be a 'Green' alternative to fossil fuels. Biofuel is a 'replenishable' fuel source. Unlike oil and coal that have finite reserves, biofuels can be produced indefinitely.
However, biofuels are still hydrocarbons. Hydrocarbons, of any sort, produce greenhouse gases and carbon based pollutants. Even burning firewood produces these pollutants.
The most promising 'Green' fuel is Hydrogen. NOT hydrocarbon based ethanol 'fuel-cells', but raw hydrogen. Think Hindenburg! Removing hydrogen from water produces oxygen, and burning it turns it back into water. No carbon dioxide! No greenhouse gases! and you help to purify a little water as a bonus.
Hydrogen is sadly misrepresented as being to dangerous for general use, and yes it can explode into a space shuttle shattering fireball. Most of us, however, don't need to carry enough fuel to get into outerspace and back, and, let's face it, you wouldn't want your tank full of fossil fuel to catch on fire either.
Trucks and trains transport hydrogen on public transit systems every day and I have not heard of any massive hydrogen explosions as a result. In fact, existing freight systems (ships and rail), would be the ideal starting point for hydrogen power adoption.
Above all, the people who are working on the problem, need to focus more on finding a solution that works, and less on finding a solution that is unique enough to patent, or complicated enough to create a lock-in monopoly.