Groundswell is using Fieldays' first day to call for New Zealand to pull out of the Paris Climate Agreement. 

The grassroots advocacy group seeks to halt or rewrite what regulations impacting farmers it calls 'unworkable'. 

Co-founder Bryce McKenzie says the agreement's costing New Zealand money and farming land. 

He says the wind's changed on this issue. 

"And I think Winston is certainly going to look at it and it's going to be more of an election issue, I think, than anything else. We all know Winston's pretty astute at picking where the people are going."

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