It's only mostly methane. There are other gases, like ethane. Ethane clogs up power plants & furnaces, so it has to be separated out from the methane. It gets used to make PETE (#1), HDPE (#2), & LDPE (#4) plastics. Natural gas extraction produces so much waste ethane that it's currently economically unviable to recycle those plastics, since it's cheaper to make new. Even if sent to a recycling facility they almost entirely get landfilled or incinerated. :(
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