The Nationals have given their in-principle support to back a target of net zero emissions by 2050, just days before Prime Minister Scott Morrison is due to fly to Glasgow for global climate talks.
The party met on Sunday afternoon to discuss its ongoing concerns about adopting the policy, with some worried it could result in job losses in regional areas.
However, Nationals leader Barnaby Joyce said most concerns had been allayed and the majority of members and senators were now onboard with the plan.
"We are in support of a process going forward that would go towards a 2050 emissions target," Mr Joyce said.
Shortly after leaving the meeting, Mr Joyce, who is also Deputy Prime Minister, called Mr Morrison to alert him to the decision.
There are conditions attached to the Nationals backing net zero emissions by 2050, but those details remain a secret.
Prime Minister Scott Morrison and Deputy Prime Minister Barnaby Joyce will meet privately to work out an agreement within the Coalition.
Mr Joyce said he understood some people in regional areas would have concerns about the Nationals backing the target.
But ahead of the meeting, Nationals deputy leader David Littleproud indicated it would not be part of the plan.
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