Fast Facts

PCE report reinforces methane not the same global warming impact as carbon dioxide

methane cow stock image

DairyNZ chief executive Tim Mackle has welcomed the report released by the Parliamentary Commissioner for the Environment, recommending methane should be treated differently to carbon dioxide and doesn’t need to be reduced to net zero.

“This work adds to the growing evidence base developed over the past few years about how methane, a biological emission from animals, differs from carbon dioxide in terms of its impact on global warming,” says Dr Mackle. “The paper states that methane needs to be reduced and stabilised in order to achieve no additional warming, rather than go to net zero. This is consistent with the international science.

“Mr Upton also recommends that nitrous oxide does not need to be reduced to net zero. We would welcome further research into this approach.

“This paper demonstrates again how the science around the impact of biological gases on global warming is continuing to develop. This is why the implications of any policy decisions for dealing with these gases needs to be carefully considered. But it is clear that total emissions must reduce.”

The science to date has supported methane being treated differently to both nitrous oxide and carbon dioxide. A split gas approach, under consideration for the Zero Carbon Bill, could recognise the differences between the gases by providing a separate target for methane.

“We agree forestry and planting will be vital to helping New Zealand meet our greenhouse gas reduction targets,” says Dr Mackle. “Many of our farmers are already planting for other environmental reasons, and often with trees and species currently excluded from the greenhouse gas inventory. It would be great to see them recognised for the carbon sinks existing on their dairy farms.

“While Mr Upton proposes forest offsets be used only for biological emissions, we think there is a role for forestry to offset carbon dioxide. We agree however that reduction efforts must occur across all sectors, and forest sinks shouldn’t be used to avoid reducing carbon dioxide emissions. All sectors need to do their part.

“Mr Upton makes an important point that unless there is a strong focus on reducing carbon dioxide emissions, our efforts to reduce biological emissions will be of little value. I expect the Climate Change Commission, once established, will examine how forestry offsets in carbon budgets can be applied across the different sectors.

“The dairy sector is concentrating on how to continue improving our emissions efficiency and reduce our total emissions. While we have options available to reduce biological emissions, the reality of doing so is quite complex due to farm system and regional differences. We are working through these challenges at the moment.

“We are also working with the Government on how best to incentivise action and recognise the good work already underway across the sector to address greenhouse gases, water quality and biodiversity. This is why we support the establishment of customised Farm Environment Plans which recognise the differences between each farm.

“Leading efforts for our sector to identify and implement strategies to reduce our greenhouse gases is part of our Dairy Tomorrow sector strategy. We are already one of the lowest emissions producers of dairy nutrition in the world, but we know we can do better while keeping our sector, our communities and our economy viable.”

Source: DairyNZ

Most Popular

Newsletter Signup

To Top