News Corp columnist Andrew Bolt

There is some dispute as to what constitutes the most difficult dive in official competition, but some say it's the back one-and-a-half somersault, with four-and-a-half twists.

It has a degree of difficulty of 3.6, but you don't have to vanish up your own arsehole at the end of it. That's what Andrew Bolt has done in his column this morning, which begins with a series of mea culpas about climate change. 

It starts: