Mining mogul turned self-appointed climate saviour Andrew "Twiggy" Forrest pulled no punches today on what he really thinks about climate change denying politicians. The billionaire has been expanding his iron ore miner Fortescue Metals Group into a renewable energy firm, which is developing project in areas including green hydrogen, solar power, geothermal, wind and hydropower. Andrew Forrest at the ABC office in Ultimo (ABC News: Sue Lannin) While discussing FMG's half-year profit results on a conference call with journalists and analysts today, Mr Forrest said that politicians who don't believe in global warming should literally take a hike. "People who do not understand the grave risk of climate change should not be in any position of influence, and if they exploit those who are trying to work against climate change, then history will judge them very, very badly. "If they don't believe the science, then they can just f**k off, right. "They should be nowhere near having any responsibility whatsoever."