(Image: REUTERS/Finbarr O'Reilly)

Andrew Forrest’s contradictions run deep. The mining billionaire who made his fortune exporting iron ore to China’s high-polluting steel mills has today slammed oil and gas companies for being climate "fossils".

But the contradictions don’t stop there. Forrest’s biggest act of cognitive dissonance is his stance on modern slavery, and it's a position that is getting harder to defend.

The billionaire has made it his mission to stamp out slavery around the world through his philanthropic vehicle, Minderoo, which helps finance anti-exploitation programs.