The world's largest sovereign wealth fund was established to invest Norway’s vast fossil fuel riches. But as the energy transition gains momentum, Norges Bank Investment Management has sought to reduce exposure to oil and gas. Instead of divesting, its strategy is to apply pressure from within. Francine Lacqua speaks to the CEO of the $1.6 trillion fund, Nicolai Tangen, about their commitment to climate change, the link between AI and geopolitics, and why he believes he has the most interesting job on the planet.