The availability of cheap meat because of the industrial animal farming practices, which don't take the environmental impacts into the calculation. There is also a vast disconnect between consumers and the animals that we consume. I think if we are made more aware, even occasionally of where our meat cuts come from and how much is sold every day collectively, we may realize how taxing it is. Also, simply celebrating the beauty and deliciousness of vegetarian recipes would help. 

Lower calorie diets will help us stay more fit and healthy. Eating slower may also help us enjoy our meals and savor the flavors. 

Research if there is one in my area. Understand what produce they grow and find out if I can purchase it instead of buying all my produce at the grocery store.