The Australian national interest deserves better than a confected country-versus-city divide over climate change, federal Liberal MP Dave Sharma says.

Mr Sharma, who holds the Sydney seat of Wentworth and who is a strong supporter of climate change action, hit back after Nationals cabinet minister Bridget Mckenzie took a swipe at both him and Treasurer Josh Frydenberg for advocating net zero emissions by 2050 without any detail.