[简答题] In the United States, the items on a typical dinner plate have traveled between 1,500 and 2,500 miles to get there. That distance has increased by as much as 25 percent over the last 20 years — an increase that comes with a series of consequences for food, farmers, consumers, local economies and even the global climate. Starting last fall on Tufts’’ Medford/ Somerville campus, students had the chance to lower the overall mileage(里程)of their lunches when the dining hall offered apples grown in nearby Topsfield, Mass. Part of the Harvest Food Festival, the "make-your-own-caramel (饴糖) -apple" display featured (特出展示) six different locally grown apple varieties. The popular Tufts Dining Services program was part of ongoing efforts to increase the amount of local produce (农产品) available on Tufts’’ campuses. Friedman School Ph.D. student Melissa Bailey is one of those devoted to the cause. Combining her interests in sustainable agriculture and public policy, Bailey took it upon