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My comment is addressed to the control of methane gas emission from
dairy and beef cattle. Recognizing the intractability of such
emissions, I wonder if a more fundamental approach to modifying the
digestive biology of cows might be feasible. Bioengineering could
provide a possible approach for achieving this objective. We know
that humans genetically vary and some generate CO2, while others
generate methane in their digestive tract. So the research should
focus on this genetic variation and investigate the feasibility of
modifying the relevant genes in cows to achieve the desired outcome