Since 1970, there has been an average decline of 60 per cent in populations of birds, mammals, fish and amphibians. In people terms, that’s equivalent to the populations of Africa, Europe, China, Oceania and both the Americas Photograph: Tilo Nadler/Conservation International/PA Wire

It has been a depressing month to be a human, and I’m not just talking about the political eutrophication to the east and west of our shores. The Worl(...)