The challenges of the future are daunting.  We must produce more food -- about twice as much as we now produce by 2050.  We must produce more nutritious food and produce it sustainably.  And we must adapt crops to temperatures higher than they’ve experienced in their history, as well as drier conditions in places and wetter in others.  And we must do this quickly -- we need to double the world’s food production capacity again, as we did over the past half century, with the same or less cropland.  In many places, the gains achieved with conventional plant breeding, mechanization and fertilizer use have already been accomplished.  In others, such as much of Africa, there is still opportunity to introduce these advances.  We will need all of the scientific and technical advances we can develop to accomplish these gains in a hotter, drier world.