In the end, New Zealand is internationally accountable for all of its emissions. If those who profit from half of those emissions entirely escape that cost, the rest of us bear it.
That is a subsidy and one that gets capitalised into land prices.
The beneficiaries are those who sell farmland and who get a larger tax-free capital gain.
The buyer just gets a correspondingly larger mortgage.
This is no different from the subsidies Muldoon paid farmers, and just as pointless and wasteful. The farming sector must be made to pay its way, like the rest of us, rather than expecting the rest of New Zealand to financially support their dirty, polluting industry.