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There are already enough uncontrolled releases of methane from
multiple major sources in multiple major countries, from unmanaged
landfill gas to fracking and pipeline release.  Methane is much
more damaging to atmospheric protection of the planet than CO2. 
Concentrated manure is a preventable source, and this process is
poorly captured.  Pipeline losses will also apply to "biogas".  In
addition to environmental impacts, community planning for emergency
situations is usually under-assessed and under-developed.  These
become gigantic explosion risks, whether or not the methane is
intended to be collected.