Jacinda Ardern is urging the Green Party not to blame James Shaw for the Government's climate agreement with farmers.

Farmers won't be subject to emissions levies, unless the industry breaches the agreement.

Some angry Green Party members now want the Climate Change Minister to stand down as Green Party co-leader, accusing him of "selling out".

Ardern told Mike Hosking Shaw didn't get the processor levies he wanted, but he shouldn't be blamed for that.

"They will be absolutely open about this, they would’ve preferred coming in first.

"I think it would be wrong to call for anything around James Shaw, he does an incredibly good job for New Zealand."

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