One trend among people who want to eat healthier, environmentally responsible diets is the 100 mile diet. Following this diet means you eat foods grown within 100 miles of your kitchen. It reduces pollution from transportation, and generally provides healthier food. (more reasons)
This diet takes considerable planning at the beginning. If you start cold-turkey, you may get frustrated by not being able to find your favorite fruits and vegetables. You have to learn a lot about the seasons, and your local farming community. Alisa Smith and James McKinnon, who wrote a recent book about the 100-mile diet, said they ate a lot of potatoes in the beginning. Finding wheat for bread was difficult in the Pacific NW. They were finally able to find a local wheat farmer.
People find it to be a rewarding experience that becomes kind of addicting. Now, when traveling, 100-mile dieters strive for local food, and really learn about the food and customs of the country they're visiting.
It's a lifestyle change. One that requires flexibility and an open mind. An easy way to start may be a state-based diet, where you eat food only from your state. The goal is to learn more about what you eat, and what you can do to reduce your footprint.