We're joined on the podcast by former Australian ambassador to Washington, Joe Hockey, who's been attending the Democratic National Convention in Chicago.

Hear the former Australian ambassador's observations of 'a very different' Donald Trump at this week's Republican convention, and his prediction of who could replace Biden as the Democratic nominee.

Most people accept our energy system must move from fossil fuels, especially coal, to renewables as soon as practicable. But there are serious obstacles on the ground – literally.