I've always been prepared to put my money where my mouth is.

Climate change is a global problem. The planet is warming because of the growing level of greenhouse gas emissions from human activity. If this trend continues, truly catastrophic consequences are likely to ensue from rising sea levels, to reduced water availability, to more heat waves and fires.

What we're seeing at the moment is people being radicalised or adopting Islamist, murderous Islamist ideology very, very quickly so that you have people that are not on the counterterrorism radar screen who then often, as a result of mental illness, will then attach themselves to this murderous ideology and then act very quickly.

When politicians offer you something for nothing, or something that sounds too good to be true, it's always worth taking a careful second look.

It is unmanly. It is not some expression of macho virtue. It is the absolute antithesis of this. Real men don't bully women and children. Respect for women ... is so important.

There is nothing more important in business or politics than a deal is a deal.

You will never find a better friend to the United States than Australia.