Changing World Technolgy has apparently managed to build a device that can digest most carbon based things into "high-quality oil, clean-burning gas, and purified minerals".
It should work incredibly well on the waste streams from industrial meat farms.
If it's used to produce most of the combusted fuels our society uses from current biologic waste it would even be carbon neutral.
So on the plus side a number if it works as advertised it could clean up a number of sources of pollution, on the downside (for me) we wouldn't have an oil shortage to get people to stop driving cars.
(Though even with carbon neutral gasoline, I can still complain about habitat loss, lung cancer, noise pollution, ground water pollution, and possibly social alienation produced by a auto-centric transportation system.)