gzt:
Imo GE and GM is not a good move for New Zealand, or the National Party. It's going to be unpopular among many primary producers, aka farmers.
Then don't allow GM crops. Or animals, or whatever. But if the farm community is given the choice between crops that require less nitrates or result in less emissions and then still choose to be GE-free, then make it clear that there won't be an ETS exemption.
GE/GMO is a thing and the sooner we embrace it, the better off we'll be. We're pretty clearly not going to be making inroads into our health or productivity through any other meaningful investments so IMO the state has an obligation to unshackle things in this regard.