Bringing agriculture into the emissions trading scheme wasn't negotiable for the Government in 2009 but now it has walked away from the problem, Labour says.
The sector had a 2015 deadline for coming under the polluter pays regime but the Government on Monday gave it an indefinite reprieve.
Labour's climate change spokeswoman Moana Mackey is reminding Prime Minister John Key that in November 2009 he told Federated Farmers national conference:
"You've got no option - if you don't deal with it now you will be punished. The consumers of the world won't buy your products."
Mr Key told reporters on Monday international progress on curbing greenhouse gas emissions had been "very modest, at best" and New Zealand couldn't afford to get ahead of the pack.
Climate Change Minister Tim Groser said the government was still committed to putting agriculture under the ETS "but now isn't the time to put the foot on the accelerator".
Farmers have always fought the ETS because most of their emissions come from methane-belching cattle and they can't do much about it.
Intensive research is being carried out to find ways to reduce it and farmers say they shouldn't be made to pay for pollution until answers are found.
Labour says the government's "ever-changing position" isn't tenable.
"The ETS was designed as an `all gases, all sectors' scheme - it simply cannot function without our single largest emitting sector - agriculture," Ms Mackey said.
NZN