Food Miles & Your Carbon Footprint


ee_foodmiles.jpg The number of miles your food travels from farm to plate makes a difference in your personal climate-change footprint. But not as much as eating red meat and dairy, which are responsible for nearly half of all food-related greenhouse gas emissions for an average U.S. household. New research published in Environmental Science & Technology finds it’s how food is produced, not how far it’s transported, that matters most for global warming. Christopher Weber and Scott Matthews of Carnegie Mellon University conducted a life-cycle assessment of greenhouse gases emitted during all stages of growing and transporting food. They found transportation creates only 11% of the 8.1 metric tons of greenhouse gases that an average U.S. household generates annually from food consumption. The agricultural and industrial practices that go into growing and harvesting food create 83%.

Switching to a totally local diet is equivalent to driving about 1000 miles less per year. Yet a relatively small dietary shift can accomplish about the same. Replacing red meat and dairy with chicken, fish, or eggs for one day per week reduces emissions equal to 760 miles per year of driving, say the study’s authors. And switching to vegetables one day per week cuts the equivalent of driving 1160 miles per year.

Why not all of the above? Though there are other factors to consider when we choose our foods, everything from the ecological costs of hunting wildlife (fish), to fertilizer runoff and oceanic dead zones (dairy), to cruelty issues (eggs). As always, and as your mama said, veggies rule.

Julia Whitty is Mother Jones’ environmental correspondent, lecturer, and 2008 winner of the Kiriyama Prize and the John Burroughs Medal Award. You can read from her new book, The Fragile Edge, and other writings, here.

MORE HARD-HITTING JOURNALISM

In 2014, before Donald Trump announced his run for president, we knew we had to do something different to address the fundamental challenge facing journalism: how hard-hitting reporting that can hold the powerful accountable can survive as the bottom falls out of the news business.

Being a nonprofit, we started planning The Moment for Mother Jones, a special campaign to raise $25 million for key investments to make Mother Jones the strongest watchdog it can be. Five years later, readers have stepped up and contributed an astonishing $23 million in gifts and future pledges. This is an incredible statement from the Mother Jones community in the face of huge threats—both economic and political—against the free press.

Read more about The Moment and see what we've been able to accomplish thanks to readers' incredible generosity so far, and please join them today. Your gift will be matched dollar for dollar, up to $500,000 total, during this critical moment for journalism.

We Recommend

Latest

Sign up for our newsletters

Subscribe and we'll send Mother Jones straight to your inbox.

Get our award-winning magazine

Save big on a full year of investigations, ideas, and insights.

Subscribe

Support our journalism

Help Mother Jones' reporters dig deep with a tax-deductible donation.

Donate

We have a new comment system! We are now using Coral, from Vox Media, for comments on all new articles. We'd love your feedback.