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Most of the GHG reduction benefit in terms of the GHG contribution of the methane itself. However, there is also the benefit of the fossil fuel combustion that is displaced if you collect and burn for power. This is exactly the sort of thing that a carbon tax would incentivize if it were at all economically sensible.

So long as there's a positive carbon return on adding the extra infrastructure.

There very well may be, but adding pipes to burn off excess methane is way easier than generating and transporting electricity.

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