Acknowledging that class conflict in world politics was a thing of the past, the new Soviet approach explicitly accepted that what united inhabitants of the common planetary home was now more important than what divided them. Hence the emphasis on the urgent need for superpower cooperation in finding solutions to the regional conflicts which had hitherto wrought such local destruction, strained their exchequers, complicated their diplomacy, and threatened to drag them into direct military confrontation. Hence, too, the much greater stress on collaborative approaches to old international problems like terrorism, old ones which had become much more serious like environmental pollution, drugs and Third World impoverishment and entirely new ones like the AIDS epidemic. In short, a constitutional order in world politics was underpinned by the concrete foundation of nuclear fear. International law is not handed down from an international legislature but is based mainly on the consent of states themselves particularly that expressed through treaties.