Trinity buys local food products such as vegetables and eggs. Dining halls serve some cage-free eggs as well as some hormone- and antibiotic-free milk, chicken, and pork. All seafood is purchased according to sustainable harvest guidelines. Fair trade coffee is available in all coffee-serving locations on campus, and discounts are offered for the use of reusable mugs. Pre- and postconsumer food scraps are composted at over half of all meals, and since 2008, some meals have been trayless. In addition to traditional materials, the college recycles batteries, lightbulbs, and used cooking oil.