They showed that global cereal yields have increased linearly at a constant rate for the last 50 years (Fischer et al., 2009), although they rightly pointed out that linear growth implies declining exponential growth as absolute yields increase. After examining the opportunities for closing the yield gap and for increasing potential yield against future needs, uncertainties, and threats, Fischer et al. (2009) are cautiously optimistic about the ability of the world to feed itself to 2050