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Natural gas is one of the top sources of energy used in heating, cooking, and electricity generation. But almost all of our supply is harvested from pockets formed deep underground, making it a non-renewable resource that will eventually run out. In searching for replacements to fossil fuels, biogas digesters have emerged as a way to turn waste into power, heat, and fertilizer. To learn more, read the guide Clarissa Drouillard prepared about biogas digesters.