The lady's argument is pathetic, HOWEVER....
Food production is one of the biggest sources of pollution and carbon emissions on the planet. Bigger than transportation, in fact. Bigger than anything besides buildings, IIRC. That dead zone in the Gulf of Mexico that's the size of California and Texas put together? It's caused mainly by fertilizer that runs off our farms, and into the Mississippi River.
I think that if you care about the environment, you should do what you can to minimize this. For example:
- Buy more organic food.
- Try to eat less meat, poultry and fish.
- Eat locally grown food when you can.