The following remarks were originally drafted to serve as the thirty-seventh Evans-Wentz Lecture in Asian Philosophy, Religion and Ethics at Stanford University in May 2006, and take therefore as their tacit point of departure the work of Walter Y Evans-Wentz (1878–1965). His Tibetan Book of the Dead, first published by Oxford University Press in 1927, long remained the most influential account of the way in which Buddhists confronted their future as mortal beings, though in this lecture the scope of my own inquiry is widened from the individual to encompass fears concerning the transience of human society as a whole. This broader approach, moreover, allows for a degree of innovation. Ever since the era of Evans-Wentz, if not earlier, the problem of presenting the impulses behind traditions as unfamiliar as those of South and East Asia without simply confirming their apparent ‘exoticism’ has been difficult to solve, but over recent years our greatly increased knowledge of the history of the planetary environment that we all inhabit has offered an unprecedented perspective on the widely shared hopes and fears of the past. This is because we now know that at times different regions of the planet were subjected to events caused by the same catastrophic upheavals in climate. By taking one of the best known of these in the sixth century CE – and the information given below by no means exhausts what has been discovered about this phenomenon – and looking at its impact in terms of the sense of foreboding it engendered, it is therefore possible to trace the extent to which Europe and East Asia reacted in similar ways.