Turner is in no doubt. “Insects are in massive decline and have been for some time,” he says. “It’s quite a clear picture and a depressing one. By any measure that you choose, biodiversity of insects is declining.” I ask him what that means. “It means something is very, desperately wrong with our world.

Turner is in no doubt. “Insects are in massive decline and have been for some time,” he says. “It’s quite a clear picture and a depressing one. By any measure that you choose, biodiversity of insects is declining.” I ask him what that means. “It means something is very, desperately wrong with our world.