Climate 200 founder Simon Holmes a Court has warned city-based Liberals they could face electoral oblivion if they step up behind Nationals MP Barnaby Joyce’s push to abandon net zero.

The renewed fight over Coalition climate policy could have near-term electoral consequences if its challenge to the result in the Sydney seat of Bradfield triggers a fresh ballot. Bradfield is held by a wafer-thin margin by Climate 200-backed teal independent Nicolette Boele.