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.

"Obviously, that is dependent upon what we see in the cabinet submissions reflecting the conversations between myself and the Prime Minister."

The Nationals met for just over two hours and all 21 members and senators spoke on the matter but no formal vote was held.

Shortly after leaving the meeting, Mr Joyce, who is also Deputy Prime Minister, called Mr Morrison to alert him to the decision.

The debate on climate change has dogged the Coalition government for over a decade.

But this time around, Mr Joyce said his colleagues decided it was better to be in "the tent".

"The easy decision would be to say 'no' and join other people in screaming and yelling from the sidelines, having no influence on where the decision went," he said.

In a statement, Mr Morrison welcomed the Nationals' in-principle support of the target.

"I thank the DPM for his leadership and his colleagues for their considered support. I greatly respect the process they have undertaken in reaching this decision."

Federal Cabinet will meet within days to formally sign off on the plan, which the Prime Minister will then take to the Glasgow climate summit.

What did the Nationals get inserted into the climate plan?

There are conditions attached to the Nationals backing net zero emissions by 2050, but those details remain a secret.

Just days ago, the junior Coalition partner presented a list of demands to the Prime Minister about the proposed climate change policy.

The Nationals have not publicly outlined the changes they want. Mr Joyce again refused to provide details about what Mr Morrison had offered or agreed to.

Mr Joyce refused to respond to questions about whether the Nationals would get another seat in Cabinet for supporting the target.

"Any decision like that is a decision for the Prime Minister," he said.

When pressed further on why he wouldn't outline the details he held his ground.

"I don't have to, mate," he told reporters.

Mr Joyce said he understood some people in regional areas would have concerns about the Nationals backing the target. But he insisted the revised plan was a better outcome for all.

"I would say to people in regional Australia, I understand completely some of the sentiments that are held there … but I say to you as earnestly as I can, there is no way we can deal with any of those if we are outside the tent."

Opposition Leader Anthony Albanese said Australians deserved to know the details of the deal.

"Well, there should be full transparency about everything that's on this list and this debate," Mr Albanese said.

Nuclear not part of the plan

Some Nationals had been pushing for nuclear to be included as part of Australia's clean energy mix. But ahead of the meeting, Nationals deputy leader David Littleproud indicated it would not be part of the plan.

"You have got to educate before you legislate and we've got to bring the community with us," he said

"That takes time to build that education up," he said.

New South Wales Liberal Treasurer Matt Kean said the proposal did not stack up on practical or economic grounds, and that his government had been told by experts it would take at least 15 years to train the workforce.

"People talking about nuclear to solve our current needs are chasing a unicorn," he said.

"It may have a role to play in the future as technology evolves so I'm not going to rule that out but right now we are focusing on the things that are going to work, drive down bills, create jobs and grow our economy."