Agriculture has been around for centuries - it is ingrained in our human roots. As a result of that, we are beginning to see environmental issues increase, including climate change. Meat production especially releases green house gases in to the atmosphere and clear the trees that manage the gases for more space, pushing up the natural temperature of the earth.
"Sustainability creates and maintains the conditions under which humans and nature can exist in productive harmony. Sustainable development is necessary to meet the needs of the present without compromising the ability of future generations to meet their own needs."