OK, so you just can't live without your beef. There are ways to help the environment and still keep meat in your diet.
"Sustainable agriculture" is a way of raising food that is healthy for consumers and animals, does not harm the environment, is humane for workers, respects animals, provides a fair wage to the farmer, and supports and enhances rural communities.
By using farming techniques such as crop rotation, conservation tillage, raising animals on pasture and natural fertilization, sustainable farmers produce food without having a negative effect on the environment. Instead of harming soil, air and water, sustainable farms actually enhance and preserve the land so that future generations can continue to use it for food production.
source: The Sustainable Table