Could a climate of change eject the Liberals from the Perth blue-ribbon seat of Curtin?

There is a good reason for that.

The Liberal MP who succeeded Bishop, Celia Hammond, holds Curtin with a margin of 13.9%. But she faces a challenge from the independent Kate Chaney, one of a crop of mostly inner-city independents backed by Climate 200 who are running on a platform of greater action on climate change and integrity in politics.

Chaney brings a cohort of a dozen volunteers with her to Cottesloe beach, projecting the image of a people-powered campaign as Sculpture by the Sea officials hover nervously, warning against turning the event into a political sideshow.

Voters say Curtin felt well-served by Bishop.

Others are attracted because she represents change.

Although some frustrated progressive voters are glad to have an alternative, many here are rusted-on Liberals.

Many are still undecided. Jane and Laura, from Claremont, are weighing the choice.

For Liberal-leaning voters the choice is one of revolution or evolution: whether a voice outside the tent can help alter the course on climate; or whether an MP in government who says her views have changed trumps the uncertainty of a newcomer.