大象传媒

Below the red-tile roofs of the Catalina Foothills, an affluent area on the north end of Tucson, Arizona, lies a blanket of desert green: spiky cacti, sword-shaped yucca leaves, and the spindly limbs of palo verde and mesquite trees. Head south into the city, and the vegetation thins. Trees are especially scarce on the south side of town, where shops, schools, and housing complexes sprawl across a land encrusted in concrete.聽

On hot summer days, you don鈥檛 just see but feel the difference. Tucson鈥檚 shadeless neighborhoods, which are predominantly low income and Latino, soak up the heat. They swelter at summer temperatures that the city average by 8 degrees Fahrenheit and the Catalina Foothills by 12 degrees. That disparity can be deadly in a city that experienced above 100 degrees last year鈥攈eat that鈥檚 sure to get worse with climate change.聽

The good news is there鈥檚 a simple way to cool things down: plant trees. 鈥淵ou鈥檙e easily 10 degrees cooler stepping under the shade of a tree,鈥� said Brad Lancaster, an urban forester in Tucson. 鈥淚t鈥檚 dramatically cooler.鈥�

A movement is underway to populate the city鈥檚 street corners and vacant lots with groves of trees. Tucson鈥檚 city government, which has pledged to plant , recently got $5 million from the Biden administration to spur the effort鈥攁 portion of the $1 billion that the U.S. Forest Service committed last fall to urban and small-scale forestry projects across the United States, aiming to make communities more resilient to climate change and extreme heat. 

But in Tucson and many other cities, tree-planting initiatives can tackle a lot more than scorching temperatures. What if Tucson鈥檚 million new trees鈥攁nd the rest of the country鈥檚鈥攄idn鈥檛 just keep sidewalks cool? What if they helped feed people, too? 

That鈥檚 what Brandon Merchant hopes will happen on the shadeless south side of Tucson, a city where about of the population lives more than a mile from a grocery store. He鈥檚 working on a project to plant velvet mesquite trees that thrive in the dry Sonoran Desert and have been used for centuries as a food source. The mesquite trees鈥� seed pods can be ground into a sweet, protein-rich flour used to make bread, cookies, and pancakes. Merchant, who works at the Community Food Bank of Southern Arizona, sees cultivating mesquite around the city and surrounding areas as an opportunity to ease both heat and hunger. The outcome could be a network of  鈥渇ood forests,鈥� community spaces where volunteers tend fruit trees and other edible plants for neighbors to forage. 

鈥淭hinking about the root causes of hunger and the root causes of health issues, there are all these things that tie together: lack of green spaces, lack of biodiversity,鈥� Merchant said. (The food bank received half a million dollars from the Biden administration through the Inflation Reduction Act.)

Merchant鈥檚 initiative fits into a national trend of combining forestry鈥攁nd Forest Service funding鈥攚ith efforts to feed people. Volunteers, school teachers, and urban farmers in cities across the country are planting fruit and nut trees, berry bushes, and other edible plants in public spaces to create shade, provide access to green space, and supply neighbors with free and healthy food. These food forests, forest gardens, and edible parks have sprouted up at churches, schools, empty lots, and street corners in numerous cities, including Boston, Philadelphia, Atlanta, Seattle, and Miami. 

鈥淚t鈥檚 definitely growing in popularity,鈥� said Cara Rockwell, who researches agroforestry and sustainable food systems at Florida International University. 鈥淔ood security is one of the huge benefits.鈥� 

There are also numerous environmental benefits: Trees improve air quality, suck carbon from the atmosphere, and create habitat for wildlife, said Mikaela Schmitt-Harsh, an urban forestry expert at James Madison University in Virginia. 鈥淚 think food forests are gaining popularity alongside other urban green space efforts, community gardens, green rooftops,鈥� she added. 鈥淎ll of those efforts, I think, are moving us in a positive direction.鈥�

Researchers say food forests are unlikely to produce enough food to feed everyone in need of it. But Schmitt-Harsh said they could help supplement diets, especially in neighborhoods that are far from grocery stores. 鈥淎 lot has to go into the planning of where the food forest is, when the fruits are harvestable, and whether the harvestable fruits are equitably distributed.鈥�

She pointed to the as an emblem of success. That nonprofit has partnered with schools, churches, public recreation centers, and urban farms to oversee some 68 community orchards across the city. Their network of orchards and food forests generated more than 11,000 pounds of fresh produce last year, according to Phil Forsyth, co-executive director of the nonprofit.

Some of the sites in Philadelphia have only three or four trees. Others have over 100, said Kim Jordan, the organization鈥檚 other executive director. 鈥淲e鈥檙e doing a variety of fruit and nut trees, berry bushes and vines, pollinator plants, ground cover, perennial vegetables鈥攁 whole range of things,鈥� Jordan said. 

The community food bank in Tucson started its project in 2021, when it bought six shade huts to shelter saplings. Each hut can house dozens of baby trees, which are grown in bags and irrigated until they become sturdy enough to be planted in the ground. Over the past three years, Merchant has partnered with a high school, a community farm, and the Tohono O鈥檕dham tribal nation to nurse, plant, and maintain the trees. So far they鈥檝e only put a few dozen saplings in the ground, and Merchant aims to ramp up efforts with a few hundred more plantings this year. His initial goal, which he described as 鈥渓ofty and ambitious,鈥� is to plant 20,000 trees by 2030.

The food bank is also organizing workshops on growing, pruning, and harvesting, as well as courses on cooking with mesquite flour. And they鈥檝e hosted community events, where people bring seed pods to pound into flour鈥攁 process that requires a big hammer mill that isn鈥檛 easy to use on your own, Merchant said. Those events feature a mesquite-pancake cook-off, using the fresh flour.

Merchant is drawing on a that Lancaster, the urban forester, has been pioneering for 30 years in a downtown neighborhood called Dunbar Spring. That area was once as barren as much of southern Tucson, but a group of volunteers led by Lancaster鈥攚ho started planting velvet mesquite and other native trees in 1996鈥攈as built up an impressive canopy. Over three decades, neighborhood foresters have transformed Dunbar Spring鈥檚 bald curbsides into lush forests of mesquite, hackberry, cholla and prickly pear cactus, and more鈥攁ll plants that have edible parts.

鈥淭here are over 400 native food plants in the Sonoran Desert, so we tapped into that,鈥� Lancaster said. 鈥淭hat鈥檚 what we focused our planting on.鈥� 

The Dunbar Spring food forest is now what Lancaster calls a 鈥�.鈥� He told Grist that up to a quarter of the food he eats鈥攁nd half of what he feeds his Nigerian dwarf goats鈥攊s harvested from plants in the neighborhood鈥檚 forest. 鈥淭hose percentages could be much more if I were putting more time into the harvests.鈥� The more than 1,700 trees and shrubs planted by Lancaster鈥檚 group have also stored a ton of water鈥攁 precious commodity in the Sonoran Desert鈥攂y slurping up an estimated 1 million gallons of rainwater that otherwise would have flowed off the pavement into storm drains.  

Another well-established food forest skirts the Old West Church in Boston, where volunteers have spent a decade transforming a city lawn into a grove of apple, pear, and cherry trees hovering over vegetable, pollinator, and herb gardens. Their produce鈥攔anging from tomatoes and eggplants to winter melons鈥攇ets donated to Women鈥檚 Lunch Place, a local shelter for women without permanent housing, according to Karen Spiller, a professor of sustainable food systems at the University of New Hampshire and a member of Old West Church who helps with the project. 

鈥淚t鈥檚 open for harvest at any time,鈥� Spiller said. 鈥淚t鈥檚 not, 鈥楲eave a dollar and pick an apple.鈥� You can pick your apple and eat your apple.鈥�

Merchant wants to apply the same ethic in Tucson: mesquite pods for all to pick鈥攁nd free pancakes after a day staying cool in the shade.

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