Nationals deputy leader Fiona Nash has joined her cabinet colleague Attorney-General George Brandis in claiming the science of climate change is not yet settled.

Senator Nash, responsible for regional development, communications and health, told Sky News there were "varying views" on climate science and she was of the opinion it was still up for debate.

"I don't think it's necessarily settled but I think we certainly think we should be taking every precaution possible to ensure that the planet is healthy," she said.

"I think there's varying views on whether it's settled or not. What I'm really focused on, again as a farmer, is that climate is changing and that we have to be able to adapt."