Honestly, I say an immediate renewable fuel is bio-diesel/e-diesel. The energy yield is quite high and it can be created quick easily without fossil fuel use. We just have to work on cleaning up the emissions a little and I really think all the money spent on ethanol could solve that problem real quick.

Just MHO.

Of course, what we really need is "Mr. Fusion" from back to the future! Just dump in your trash and bam!

Mike