Surely you just outsource the problem?
We've binned off a lot of our industry as it is polluting, but instead of reducing consumption, we now import from countries with worse practices, resulting in a net increase in emissions.
If NZ taxes it's farmers, people will buy from elsewhere, where meat can be produced more cheaply.
If we actually want to reduce our impact, we need to consume less and that includes everything, not just meat.
I had an interesting conversation with my wife last night, after finishing a review on a planning pack for a hyperscale data centre I'm working on. Does anyone consider the impact of their superfast internet, or the millions of photos and videos held on cloud storage? The amount of energy consumed to run these data centres is astounding. Then you have the issue of (typically diesel) back-up generators that are routinely tested, clocking up huge emissions over the year, which are there to provide resilience in the event of a power outage, even though there are multiple redundant connections and a power outage is virtually impossible. All these emissions are simply to give peace of mind that there won't be a 1 in 1 million chance of a 13 second drop-out on the internet.
We really have our priorities mixed up!