Growing meat requires a lot more calories in the form of animal feed then you get from the meat. Depending on the type of meat it can be 2 times as much up to 10 times as much. So in the worst case you might need 10 square feet of corn to make the same amount of food in the form of meat as you would do with 1 square foot of corn when eating it directly. The extra calories is released as carbon dioxide, methane and also causes other environmental issues in addition to the increased land use. But maybe more important the animal feed is being processed and transported in order to be used which in most cases will take fossil fuel. When you reduce the amount of meat in your diet you reduce the amount of fossil fuel used to make your meals, the land use and reduce other environmental footprints.
For animal products other then meat a similar logic applies. The chicken need food to lay eggs and the cows need food to make milk. And most of these calories is spent by the chicken and cows rather then end up in the products. But other animal products are byproducts from the slaughter industry and therefore would be made anyway as long as we have a meat industry. So the general advice is to reduce your consumption of meat, milk and eggs as these are the worst issues.
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