Combat food waste by planning ahead, only purchasing food you know you will eat, and taking smaller portions at the dining hall (you can always go up and get more food!) If you do need to trash expired or rotten food, compost it instead of throwing it in the landfill.
Limiting the meat--especially beef--that you consume can reduce this air pollution.
Filling your plate with plant based foods wastes far less emissions than consuming animal products.
Organic fruits and vegetables create fewer greenhouse gas emissions than products with GMOS and do not pollute groundwater with harmful chemicals.