Emissions & Climate

New Zealand has the most unusual emissions profile of any developed nation. While agriculture typically accounts for ~12% of emissions in OECD countries, it's responsible for over half of ours — a direct consequence of our grass-fed, export-driven farming model. This means NZ can't decarbonise the way most countries do (by cleaning up energy). We need to solve a problem nobody else has solved: how to cut emissions from biological processes in animals, at scale, without destroying the economic backbone of the country.

Agricultural emissions come from two gases: methane and nitrous oxide. Methane (~80% of ag emissions) comes primarily from enteric fermentation — the digestive process in ruminants that produces methane as a byproduct, released mainly through burping. Nitrous oxide (~19%) comes from nitrogen in soil, urine, dung, and synthetic fertilisers being converted by microbes. These are fundamentally different from CO₂ emissions — you can't just "switch fuel" to fix them.

Methane and CO₂ behave very differently in the atmosphere — and this matters for policy. CO₂ accumulates for centuries; methane breaks down in about 12 years. This means stable methane emissions don't add warming over time (they maintain the current level), while any CO₂ emission adds permanently. The scientific debate: should NZ aim to reduce methane to actively cool the atmosphere, or simply stabilise it to prevent additional warming? The new government has chosen the "no additional warming" approach — controversial among climate scientists.

NZ was going to be the first country to price agricultural emissions. Now that's on hold until at least 2030. The He Waka Eke Noa partnership (2019–2024) tried to design a farm-level pricing system. It collapsed amid political tension. The current government has scrapped pricing in favour of "technology and partnership" — betting on innovation rather than carbon taxes. Agriculture remains the only sector exempt from the ETS.

The government is betting on technology — but most solutions aren't ready for NZ's pasture-based systems. Products like Bovaer work well in barns where feed can be precisely controlled; they're less effective for animals grazing outdoors on grass. NZ researchers are developing alternatives including probiotics, slow-release boluses, and low-emission breeding programs. The question: can these scale fast enough to hit targets?

NZ's situation is genuinely unique — but the world is watching what we do. Other countries can decarbonise by switching from coal to renewables; we already have 85%+ renewable electricity. Our challenge is solving agricultural emissions at scale, which nobody has done. If NZ develops working solutions, we could export that knowledge globally. If we fail, it signals that grass-fed agriculture and climate goals are incompatible.