The USDA's MyPlate standards support 5-6 ounces of meat a day for adults, but American adults ate up to 10 ounces per day in 2018. Meat and dairy have very high carbon footprints that exceed well beyond most foods. In fact, 7 of the 10 foods that have the highest carbon footprints are meat and dairy, from chicken to cheese to beef.
I don't think eating less meat and dairy is the right word for students (well, maybe for me because I'm still in middle school), because nearly all of your food in your early years will come from your parents. They're the one making money and picking your groceries, and are the ones that dictate how much meat might come out of a processing plant. Encourage them to pick out more of your favorite vegetables and less of that big slice of beef. Choose almond, rice, oat milks or buy vegan cheese made without a cow's help.
One trick that can work if you are disadvantaged in a really meat-heavy house where there's always an option for meat every meal, try and "ration" the meat throughout your next meals: maybe a big sirloin steak served to you during dinner could be divided into thirds, and you eat a third during that dinner, store the food away, eat another third during breakfast, store it away AGAIN, and eat the last third during lunch. Focus on eating that steak ONLY, and once it's done you can move on to another piece of meat.
At first, you can potentially end up with a lot of meat in your parents' and siblings' plates, but if you get your siblings or one of your parents into the act, you could start to argue that the family doesn't need as much meat as it needed in the past, making your parents buy less meat naturally. Then, you could take the next step and try and eliminate more or even better, all of the meat that your family eats. Replace it with plant-based beef if you want to.
About 40% of Earth's fertile land is used for livestock purposes. But if we lower our meat and dairy consumptions, our families can lower our carbon footprints by up to 28%, which can have big changes in our missions to get to net zero.