Modern industrial agriculture damages our planet more than emissions from automobiles. Overused pesticides, herbicides, and antibiotics pollute our air, water, and soil. Then there is the transportation and packaging. The corn and wheat in your hamburger bun might be locally grown but manufactured in another country, then shipped back to the U.S. That bun may not cost much monetarily, but it leaves a lasting impression on our world. Many of our food products are individually packaged, which not only wastes resources and creates trash, but also pollutes our air.
Now I don't expect you to completely change the food you eat. Just try to keep this in mind this when you're shopping. Choose the locally grown tomatoes even if they are $0.10 more per pound. Try planting your own garden. Perhaps do a little research on restaurants in your area that choose greener agriculture and livestock. These are the little ways we can relieve the stress on planet.