Holly Fretwell of PERC discusses the huge leap in agricultural yields since WWII
Not only does this mean that we have have billions of people on Earth and not starve, but it also has freed up labor for more productive and value-enhancing activities.
As an aside, remember this chart when global warming alarmists argue the the warming trend of the last 50 years is reducing crop yields. (If the linked article seems simply bizarre given the chart above, realize the NYT is saying that crop yields are down from what they might have been. This is the same kind of faulty logic that was used by Obama to credit his stimulus with job gains when in fact the economy was losing jobs. They posit some unproveable hypothetical, and then say reality diverged from that hypothetical because of whatever factor they are trying to push, whether it be CO2 or stimulus).
The problem with food prices is not production, its the fact that we take such a huge percentage of our food grains and, by government dictat, convert them to automotive fuel.