The half-life of humanity is currently around 35 years, said Nobel laureate in physics David Gross as he concluded an evening lecture at the German Physical Society's conference in Erlangen in March.
The Canadian prime minister, Mark Carney, inspired a wave of enthusiastic nodding among the cosmopolitan crowd gathered in Davos last month when he took to the podium and proclaimed that the world order underwritten by the United States, which prevailed in the west throughout the postwar era, was over. The organizing principle that emerged from the ashes of the second world war, that interdependence would promote world peace by knitting nations' interests together in a drive for common security and prosperity, no longer works.