If you believe famine is going to trend down I encourage you to take a hard look at what percentage of arable land globally is currently in use (we're close to maxed out), how much of that agriculture is dependent upon non-renewable water sources (aquifers), or other water sources that will be impacted by warming. Toss in topsoil depletion, erosion, and desertification. I am fairly certain that a sober look at these things will paint a much grimmer picture of the future.