And then there’s climate change. We are rapidly moving out of the temperature range in which we domesticated our current, water-inefficient, temperate staple crops.  To give you a taste of what that will mean, I draw your attention to the small x, which was the very hot summer of 2003 in Europe.  We all remember the reports of 30-50,000 heat-related deaths, but who remembers that crop yields decreased by a quarter to as much as a third?  Well if these models are even close, that will be an average summer by midcentury and an anomalously cold summer by the end of the century.