I wouldn't go that far, although I'd agree better using grapes...... 😀

Seriously, though, I agree with the rest of what you're saying. The answer isn't just a matter of finding a different source of energy, but instead a far more complex picture of how we (re)use a whole gamut of finite resources. Far more can be done to reuse and/or recycle waste and byproducts, and far more can be done to reduce our energy requirement in the first place. IMHO, both those are rather more important than finding an alternative substance to burn as engine fuel.