[benj111]

The article mentions this could reduce Australias ghg emissions by 10%, figures I've found for the UK suggest 3%. That's a massive cut no matter how you cut it, and shouldn't be ignored.

You cant just say cows were domesticated before the industrial revolution, ergo cows are ok, and shouldn't be part of the solution. Animal husbandry has changed massively in the past 2/300 years, you are comparing apples and oranges.

My 2 orders of magnitude guess is conservative. Population has increased by well over one order of magnitude since the industrial revolution. Per capita meat/dairy consumption accounts for the rest.