Australia's two newest senators say action on climate change will need to be front and centre of the agenda when federal parliament resumes on Monday.
Greens senator from WA Dorinda Cox and Labor's Karen Grogan from South Australia will become the newest members of the upper house.
They both say a net zero by 2050 target is essential.
But the issue is causing ructions in the coalition, with the Nationals due to meet on Sunday to consider a revamped climate plan, the Liberals to hold talks on Monday and the joint party room to thrash it out on Tuesday.
Labor says any new targets need to be legislated, but the government is resisting the idea.
Prime Minister Scott Morrison is confident he can land a plan by the time he heads to Glasgow for the UN's COP26 talks.
Senator Cox, who will be the first Indigenous woman to represent WA in the upper house, said locking in a net zero emissions target was critical in order to protect First Nations communities.
"The impact of climate change disproportionately affects vulnerable target groups," she told AAP.
"Weather patterns are going to be more extreme and affect regional communities and First Nations people, and others who don't have the means to be able to plan for that."
Senator Grogan, who will replace the late Alex Gallacher, said a lack of action on climate change would leave Australia isolated on the world stage.
"We have very serious concerns about how Scott Morrison is going to deal with the issue, and it's been quite a debacle over the last eight years," she said.
"The policy needs to build a renewable pathway and help reduce emissions in a genuine way."
The two new senators will deliver their first speeches during the sitting week.
The Senate is also expected to endorse WA Liberal Slade Brockman as the new president, replacing the outgoing Scott Ryan.
Labor deputy leader Richard Marles will not be in attendance, due to him visiting a COVID exposure site and needing to isolate.
A Senate inquiry report will also be handed down into the destruction of the 46,000-year-old caves at Juukan Gorge.
Australian Associated Press