I eat eggs and my kids drink milk but some people find unethical the environmental impact of using animals to convert relatively efficient vegetable production

I eat eggs and my kids drink milk but some people find unethical the environmental impact of using animals to convert relatively efficient vegetable production to relatively inefficient animal production. Some info: http://en.wikipedia.org/wiki/Environmental_impact_of_meat_production http://en.wikipedia.org/wiki/Environmental_impact_of_meat_pr... Another thing people find unethical about it are adding literally tons of needless antibiotics to the environment which can have human medical impact.