POTD: Gleaning

Livingston, Montana

I’ve heard that getting oil from tar sands or even ethanol from corn is very inefficient in the sense that the net energy gained from the fuel after extracting and refining is a very low percentage of the energy required to produce it. Perhaps that is not unlike crows and ravens searching for tidbits of food in a lawn–they¬† seem to spend a tremendous amount of time poking around before finding a small bug or other morsel. No wonder they seem to prefer congregating around garbage cans and dumpsters, the yield is much better.