wasn't there a diet change that reduced it by 99% without gay chemicals? > a 2017 study found that adding less than 2% dried seaweed to a cow's diet can reduce methane emissions by 99%. a 2019 study found that the red macroalgae asparagopsis taxiformis can reduce methane production by up to 99% when added to rhodes grass hay.  so their thing does a worse job and gives you cancer? sign me up.
Canada