I appreciate the question from the shadow Treasurer. He was the parliamentarian who tweeted asking Australians what he should do about climate change, particularly when he has had a lifelong support for a price on carbon.

So enough of the hypocrisy from the shadow Treasurer—enough of that. We on this side of the House have always believed in putting a price on carbon and, until the leadership of the Liberal Party changed, so did they. The member for Wentworth, when he was Leader of the Opposition, believed in putting a price on carbon. And there is a very good reason for that: so we could encourage investment in renewable energy, because no prosperous, first-world country in the 21st century can remain so unless they price carbon. That was a bipartisan consensus in this parliament.