I think we can all try to do our best to eat and live in a more environmentally friendly way.
Eating lower on the food chain is a good first step.
I agree with eating locally (usually fewer chemicals are used, even on non-organic produce, and the food doesn't have to be shipped long distances, or at least within 100 miles and eating organically as much as possible. Food coops and farmers markets are good places to find local foods. And I think everyone who can should have some kind of garden of their own (organic, of course). Even if it's just a sprout garden on your countertop, growing broccoli sprouts!
Avoiding GMO foods, that are an environmental disaster waiting to happen, IMO, is also important. Unless it is organic, or labelled as "non-gmo," most soy, canola and corn is GMO, as are many potatoes.
Hemp is a very environmentally friendly crop: grows fast, blocking out most competing weeds, and is naturally pest and disease resistant, and actually enriches the soil. And it can be used for so many things : a high-quality protein powder, an ingredient for baking, oils for cooking and body care, fabric for clothing.
Avoiding processed foods (especially things that have lots of packaging vs. content) helps reduce waste as well as being healthier.
Not food related (in general), but the growing of cotton, touted as a 'natural' product, isn't that good for the environment. Cotton crops take up about 5% of agricultural land worldwide, but use about 25% of all agricultural chemicals. Buy organic cotton instead to be "environmentally smarter".