Michael O'Leary, the controversial Ryanair boss, has denied the existence of man-made climate change.Ryanair boss Michael O'Leary denies man-made climate change. His comments have struck a sour note with environmental campaignersThe chief executive is known for ruffling feathers, previously suggesting he would like to charge passengers to use the lavatory on his flights and make overweight passengers pay extra.His latest comments, in which he said the idea man-made pollution is heating up the planet is "horse ****", have struck a sour note with environmental campaigners – something which is unlikely to unduly trouble O'Leary.