"Now this has now become a question not simply of the environmental responsibility of the Liberal Party but of its integrity. We agreed with the Government on this deal. We must retain our credibility of taking action on climate change. We cannot be seen as a party of climate sceptics, of do nothings on climate change. That is absolutely fatal. And we also must be seen as men and women of our word. We entered into a bargain. There was offer - and there was acceptance….

Now I know, and I just repeat this, this is a difficult issue for many Liberals, many Australians. But I repeat most people who doubt the science also know that it makes sense to take out insurance, to manage the risk, to give the planet the benefit of the doubt. Now at the moment, as you know, some of my colleagues have found it necessary to resign from ministerial positions so they can cross the floor on the issue. That is their right and I respect it. But I believe we must maintain this course of action. It is the responsible thing to do. It is the honourable thing to do."

Malcolm Turnbull