According to one estimate, meals in the United States travel an average of 1,500 from farm to plate. This represents a highly complex logistical system.
Agriculture and food scientists are responsible for packaging and transporting these items safely and economically. In addition, they often perform practical duties on farms, work for retailers, and perform analysis of agricultural trends.
A large number of them work for the government, either as agricultural inspectors, as educators, or in a conservation role.
Both due to more stringent environmental regulations and generally higher food standards, this is one degree that's well worth getting in Europe. Famous universities like Wageningen in The Netherlands, Hohenheim in Germany, and Szeged in Hungary are all well-known for a high standard of education (and low tuition fees).