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They can; this is generally referred to as "biogas" (https://en.wikipedia.org/wiki/Biogas). It's equivalent to Carbon Capture and Storage, but for all of these methane releases. It's only used on a relatively small scale in rural areas, mainly to save money on natural gas (which is also basically just methane) and its related distribution infrastructure; I haven't heard of any successful projects to harvest biogas on the large scales required to really cut down agricultural and landfill emissions. The main challenge seems to be purification, as biogas has all kinds of nasty contaminants that are bad for people and machinery.

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