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An anaerobic digester (basically a biological process that occurs without oxygen) is a way to turn kitchen scraps and other organic waste (including feces) into methane gas (which can be used to cook with) and fertilizer.
DIY Example: Metal Drum
Video Instructions/demo. Not the best how to, but a good overview of a simple system. Part 1: Overview
Part 2: A look inside
Part 3: Using the fertilizer