Plenty

In the book Plenty Alisa Smith and J.B. Mackinnion chronicle their journey of one year eating the 100-mile diet. The book's website has a "getting started guide" to help you start the local food challenge. Eating locally isn't necessarily "better" for the environment. There are many factors that go into the environmental footprints that your food makes. The production methods, processing, travel and method of travel, etc. It is true that often local food is more environmentally friendly and sustainable for several reasons:

Small farmers often focus on producing food organically and chemically free even if they don't pay for the organic label.

Food travels less distance to get to you. Keep in mind the distances a farmer might travel delivering food all over a county or the distance you may drive to get from the farmer market to the grocery store, etc.

Eating locally usually requires eating seasonally, which prevents extra food miles, and harsh preservation methods such as freezing.

When purchasing food from local producers it is easier to get in contact with them and learn about their methods of production first hand. Don't expect better standards automatically from local producers, always ask. Farmers that are proud of their work will be happy to talk to you about it.