The world’s population may have recently topped 8 billion for the first time, but where the worries were once about the world becoming too crowded, now the concern is about a drop in global fertility rates. There are very real fears that a shrinking, ageing population could be catastrophic for the global economy and its healthcare systems. But some experts argue that there might in fact be an upside to population decline – especially when it comes to the earth’s natural resources.In this...