It's a pretty complex issue when you break it down like this.
Some ways to lower your carbon food print:
(1) Eat local, or better, hyperlocal *
Eating local cuts down on food miles, the number of miles your food has had to travel to get to your plate. A lot of locavores sprung up when the book 100-mile diet was published in 2007. Now, there is a new movement of hyperlocavores, people who eat food they grow themselves - the ultimate reduction in greenhouse gas emissions.
(2) Eat organic *
Food that is grown organically never involves petroleum-based pesticides. Enough said.
(* See my Aquaponics Technical Description (coming soon!) to learn about this organic food production method that can be used to grow food locally.)
(3) Eat a diet low in animal products
Alright, so there's the cutting down on the flatulence issue. But it's not only that: SO much energy is put into producing feed for livestock. That's a lot of energy consumption!
When food breaks down, it releases methane into the atmosphere, which contributes to global climate change. So, compost your food waste instead. Live in an apartment? See my instruction set on how to vermicompost indoors (coming soon!) to get started.
These are pretty basic. If you want to figure out your own carbon food print, check out the Low Carbon Diet Calculator.
I realize that eating local and organic can be (okay, it is) more expensive, but think of the expense on the environment and your own health. Plus, climate change seriously threatens our food system by creating extreme weather events like drought and severe storms that damage crops. How much more expensive is food going to get when it becomes in short supply? Think long term, not short term. Thinking short term got us into this problem in the first place.
More on the real cost of food next time. Until then, if you would like to better understand how our food system is dependent on oil, watch this: