I've been reading 'The Big Necessity' by Rose George - a book on human waste (not trash, mind you, but defecation). It is an amazing chronicling of waste disposal around the world, its attendant difficulties, and why it is so important to get it right (disease mitigation primarily, plus water conservation).
Throughout the book are various ingenuous ways waste is used to generate gas (for cooking and lighting) or electricity in addition to fertilizer. So, this segment on NPR caught my ear: The Denver Zoo is installing a waste gasification plant on-site that will turn 'Poop to Power'.
Although the payback will take a number of years, this has got to be a better approach than moving the waste to a landfill (carnivore) or even the composting that is done with herbivore waste. Listen for the full story, and take note of just how much 'poo' an elephant makes on a daily basis!
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