Tasked with rewiring WPP’s media arm, GroupM Global CEO Christian Juhl is going a couple of steps further, attempting to redefine buying metrics and pressure suppliers – i.e. media companies, including Facebook and Google – to decarbonise. If media owners don’t play ball, will GroupM pull dollars? “We’ll certainly make that recommendation,” says Juhl. He thinks focusing on bigger, better global outcomes can make advertising a good place to be for agencies, brands and consumers – and the rewards will follow. Meanwhile, he says incoming ANZ boss Aimee Buchanan has pretty much carte blanche to make sure GroupM is top dog locally. Which means dethroning OMG.