It is sort of interesting -- in the US, we waste about 30%-40% of our food, so there's clearly enough food that we should be able to capture some excess (possibly changing our diets slightly, to make sure to eat stuff that spoils quickly and save stuff which can be made shell stable). Say we can only capture 1/4 of it, so, we stockpile ~a country's worth of food per decade. This seems like the most obvious possible thing for a people that has already met it's needs to do -- prepare for an emergencies. But we've never seen a famine like this, so we probably won't prepare for it.