| Abstract: | For a generation there has been unresolved debate between anxious environmentalists and sanguine ‘contrarians’, both of which have been able to amass strong evidence in favour of their positions. This is an important paradox, and the paper attempts to resolve it by means of an elementary but robust model of environmental trends between 1950 and 2100. A crucial feature of the approach is to disaggregate the developed ‘North’ and developing ‘South’, revealing strikingly different patterns. The North's environmental impact will decline steadily, but in the South a rapid increase in environmental impact can be expected in the first half of the 21st century, followed by an equally rapid decline. This dramatic environmental ‘spike’ will be unique in human history and mark a fundament transition to the sustainable state. Its qualities and duration will determine many features of the human and natural world for millennia to come. Many policy implications flow from this analysis. Controversially, it suggests that the ‘spike’ should be embraced and managed rather than avoided or delayed. |
