Maybe I missed it, but has anybody mentioned the extensive research being done on use of hydrogen as a power source? There's plenty of it, but the problem is the expense of extracting it from water.

Hydrogen Fuel - Energy from reacting hydrogen (H2) with oxygen

A plentiful fuel source for our nation's pioneers was dry cow or bison dung. (My wife edits my postings. She recommends "dung" in place of the term I originally used.) When I was a kid camping out with my buddies we always collected a bunch of cow patties for fire starting material. It worked well in that capacity but I don't think I'd use it for weenie roasting or in my barbecue.

Jim