Meat production is about 15% of our global carbon emissions, so certainly it can't be ignored - but when the other 85% is coming from activity fueled by petroleum+coal, it doesn't make a lot of sense to throw up your hands to reject a carbon tax because there's "thousands" of emissions source (which ones?) which collectively amount to less than a percentage point of our carbon footprint.

We mustn't let the best be the enemy of the very, very good. A straight-forward carbon tax on fossil fuels is both enforceable, linear, and not that complicated. Can we ignore ranching and meat production? Of course not. So let's tax both.