Cooked: Does eating local really reduce your impact on climate change?

We look into why buying local food matters in Cooked, our newsletter on the search for sustainable eats in New England.
We look into why buying local food matters in Cooked, our newsletter on the search for sustainable eats in New England.

This is an excerpt from WBUR's Cooked newsletter. Sign up to understand how to reduce your impact on climate change and take actionable steps so YOU can make a difference.

It was a big day for Kannan Thiruvengadam. A flatbed truck was arriving with his farm’s first greenhouse, and he was bouncy with anticipation.

“This is so exciting!” said Thiruvengadam, who does actually speak in exclamation points. “It'll be a space for people to come together, have some food that's harvested right there!”

But the farm is in East Boston, and that morning he had a very Boston problem: two illegally-parked cars blocking the delivery route.

“This has nothing to do with the greenhouse!” he laughed. Then he reconsidered. “It’s an urban farm; this is an urban greenhouse and an urban problem.”

The shipping container holding the greenhouse arrives at Eastie Farm. (Jesse Costa/WBUR)
The shipping container holding the greenhouse arrives at Eastie Farm. (Jesse Costa/WBUR)

Eastie Farm is made up of seven small plots of land — and now one greenhouse — sandwiched between buildings and behind billboards around East Boston. The neighborhood has the highest immigrant population in Boston and a median household income below the rest of the city. It’s also the Boston neighborhood with the farthest average distance to a grocery store.

Thiruvengadam's farm helped feed people in the pandemic and supplies 200 produce boxes a month to elderly people living in public housing. But he acknowledged his tiny farm can only make a small dent in food insecurity. “We do not grow enough food to feed even a block of East Boston, probably,” he said.

But he’s got another mission: connecting people to their food. For him, there’s magic in a child pulling a carrot from the ground and realizing with a shock that vegetables grow in dirt.

“This is where you get connected to the Earth, and we need that connection back,” he said. Food “doesn’t come out of nowhere.”

This is the root of the problem, so to speak: most of us don’t know where our food comes from, so we don’t understand its effect on the climate. Local food can be part of the solution, but maybe not in the way you think.

So, where does food come from in New England, other than Eastie Farm? Let’s look at some numbers.

The Numbers Tell A Story

  • There were about 16 million acres of farmland and about 250,000 farms when New England agriculture peaked in the late 1800s.
  • There are now just under 4 million acres of farmland in New England, and about 30,000 farms, though this number has risen slightly in recent years.
  • Massachusetts ranks among the states with the highest risk of farmland loss in the country.
  • New England farmers produce about half of the region’s dairy (with about 200,000 dairy cows), but only a small fraction of its beef, pork and poultry. Vermont produces the most dairy in New England.
  • We New Englanders kick butt in maple syrup, producing about 65% of the national supply. Vermont alone produces 47%. Maine dominates the country in wild blueberries, harvesting more than 40 million pounds in 2020.
  • Despite this abundance of milk, maple syrup and blueberries, New England farms produce only about 12% of the food we eat in the region.
  • The Natural Resources Defense Council estimates that most produce grown in the U.S. travels about 1,500 miles before it’s sold. This journey that cucumbers take from the farm to you is known as “food miles.”

Deep Dive: The Truth About Food Miles

Aha, you say — let’s cut down those food miles! And it makes sense: food trucked 30 miles has a smaller carbon footprint than food trucked 3,000. Turns out, however, food miles don’t matter as much as we thought. Transportation accounts for only about 11% of a food’s emissions in the U.S. (Fish is a little different, but we’ll cover that in the next email.)

One study suggested that occasionally swapping out red meat and dairy, even less than one day a week, makes a bigger dent in emissions than buying all your food locally.

“A lot of people have the idea that buying local food is the thing to do for climate, but it's actually not the case. The data don't bear that out,” said Tamar Haspel, a Washington Post food and science columnist, who details her Cape Cod food-growing experiences in the book “To Boldly Grow.” “Getting a food from far away where it can be grown efficiently almost always does have a lower climate impact than getting something from your local farmer.”

It’s also about “how does it travel,” said Tim Griffin, director of the Agriculture, Food and Environment Program at Tufts. Tomatoes arriving by ship or train have a smaller carbon footprint per tomato than food that is flown in or the two tomatoes you picked up at that quaint farm after driving hours into the countryside.

This was not the message I wanted to hear, by the way. So, when Griffin first told me this, I basically threw a tantrum and demanded proof.

Well, those smart grad students at Tufts went out and did some sleuthing for us. Here’s what they found:

Local cheese versus far-away cheese

Cheese at the Boston Public Market. (Hadley Green for WBUR).
Cheese at the Boston Public Market. (Hadley Green for WBUR).

Whether your cheese comes from Vermont, Wisconsin or California, it still comes from burping cows. “Most of the impacts come from the production of milk,” said Tufts student Alexandra Stern. Food miles account for a small amount of emissions, “but for other impact categories like water or land, the fact that it's local doesn't really change much, especially if the practices for producing the cheese are very similar.”

Local tomatoes versus Florida tomatoes

Tomato seedlings at the Fowler Clark Epstein Farm in Mattapan. (Jesse Costa/WBUR)
Tomato seedlings at the Fowler Clark Epstein Farm in Mattapan. (Jesse Costa/WBUR)

In the summer, when stores are heaped with locally-grown tomatoes, buy them!

But in the middle of New England winter, nobody is growing tomatoes locally unless they’re hydroponic or in a greenhouse. While these practices can be environmentally sound, studies show that tomatoes grown in a Florida field had a lower environmental impact than greenhouse tomatoes from Ontario (sorta local) or hydroponic tomatoes from Maine.

“Trying to grow local can do more harm than good,” MIT research scientist Elodie Blanc wrote in an explainer. “If, for instance, producing locally entails growing tomatoes in greenhouses that need to be heated, then the environmental footprint will be much higher than growing them in a suitable region and transporting them, especially if they're transported by boat.”

Maple syrup and honey versus cane or beet sugar

Ronald Kay checks the evaporator in the maple sugar shack at Maynard Maple. (Jesse Costa/WBUR)
Ronald Kay checks the evaporator in the maple sugar shack at Maynard Maple. (Jesse Costa/WBUR)

Big win here for local sweeteners!

The research suggests honey and maple syrup have far lower environmental impacts than cane or beet sugar, even though it can take a lot of energy to turn 40 gallons of tree sap into 1 gallon of maple syrup.

Cultivating sugar beets and sugar cane leads to high emissions, soil erosion, heavy water use and diminished biodiversity. And honey and maple production offer large ecosystem benefits, like carbon stored in maple trees and bees pollinating vegetables.

Ah, the sweet taste of local victory!

Griffin made a good point, though: given the huge amount of refined sugar that Americans eat, there’s no way honey and maple syrup could scale up to meet demand.


Food miles matter, but what matters much more is how the food was produced and how it got to you.

3 Reasons Buying Local Matters

So, should you stop buying local food? No way! Supporting New England farmers is important for lots of reasons. “You get this agricultural economy that’s local. You get to see where it comes from. You get to talk to the person who grew it. You get to bring a kid to see, you know, a pig or a carrot or an apple,” said Haspel. “And those things really matter.”

And, since we’re focusing on the environment, here are three reasons why buying local matters in a climate-changing world:

1. You think COVID-19 screwed up the supply chain? Wait ‘til you see what climate change can do. 

Climate change is already disrupting American agriculture, like the historic flooding that hit the Midwest in 2019. New England cannot grow enough food to feed everyone who lives here, but we can definitely grow more.

“This place that we call New England has a history of feeding people very well for thousands and thousands of years,” said Lisa Fernandes, communication director for Food Solutions New England, which hopes that 30% of the region’s food will be produced locally by 2030. That number could possibly go higher, she says. “There's absolutely the potential to do a lot more in terms of [vegetable] and fruit crops. We have the climate to do that. Even though it's changing.”

Growing more food closer to home will make the region more resilient to climate change, Fernandes said. That’ll help keep the shelves full “if things hit the fan.”

“We’ll be able to respond and take care of each other in times of disruption, like more pandemics or supply chain issues or serious weather disruption due to climate change,” she said. “Building up a strong enough, resilient regional food system in New England is something that you'd rather be five years too early than five weeks too late to do.”

2. Diversified farms often adapt better to climate change.

Agriculture in New England is feeling the effects of climate change: maple sugar season is getting shorter and less predictable; fruit trees are suffering from less distinct seasons and erratic weather.

Desa Van Laarhoven, executive director of Round the Bend Farm in Dartmouth, Mass., said she’s seen a huge uptick in windstorm intensity over her 13 years on the farm: “It’s completely different than it was in the beginning.”

New England, like the rest of the country, has big industrial farms that grow lots of food efficiently. But growing only one crop, like potatoes or apples, can leave farms vulnerable to climate disruptions like severe storms and invasive pests.

The region also has thriving, diversified farms, with a mix of crops and livestock. These can often adapt more quickly and experiment more easily with things like climate-resilient crops, agroforestry and “dual-use” solar.

At Round the Bend, for instance, garden manager Benoit Azagoh-Kouadio is using woody debris from wind-damaged trees to try Hügelkultur, a technique of growing crops on a bed of buried, rotting logs. “As that breaks down, it'll provide years and years of fertility for these beds,” he said. “It does pay off in the long run, in terms of creating an ecology that is really healthy and nutritious and abundant.”

Regenerative agriculture can also build soil that stores carbon. Scientists are still figuring out how exactly to measure carbon storage and loss in soil, but the idea of using our dirt wisely has gained traction as a possible climate solution. Healthy soil also supports biodiversity, from birds and bugs to blue toadflax.

3. Urban farms can mitigate extreme heat, flooding and other effects of climate change in cities.

In Boston, places like Eastie Farm, ReVision, The Food Project and the Urban Farming Institute offer ecological advantages like cooling green space in urban heat islands, reduced air pollution and stormwater drainage.

Tristram Keefe, farm enterprise manager at the Urban Farming Institute, said urban farms can also serve asentry points for people who are kind of alienated from the land.” Reconnecting city-dwellers with dirt, farming and food may be the first step toward a more sustainable food system.


Barbara Moran Correspondent, Climate and Environment
Barbara Moran is a correspondent on WBUR’s environmental team.



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