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“Dictatorship always tries to keep things secret,” he explained. “These kinds of testimonies are against forgetting. They will preserve memory for the country and serve as a way to guard such things happening in the future.”

Ridha Moumni, a curator of the exhibit, insists it is not political, but a matter of history. Yet he is displaying events that Tunisia’s dictators sought to suppress.“We have a very rich heritage that no one knew about,” Mr. Moumni said. “Our goal was to show that Tunisian modernity did not start with independence or colonization.”

it provides a history lesson on the significant reforms of the era — the founding of the army, the drafting of a constitution and development of diplomatic relations — that helped forge a nation

Among the original documents on display, one abolished slavery in 1846 — before the United States did so

a constitution drafted in 1860 that recognizes the rights of all citizens, including Christian and Jewish minorities, and census registers, in Hebrew and Arabic, belonging to Tunisia’s ancient Jewish community

Another discovery is the diversity of Tunisia’s leaders — from the Christian foreign minister, Giuseppe Raffo, to a Circassian general, Kheireddine Pasha, and the former slave Mustapha Khaznadar, who married into the royal family and rose to become the bey himself.

Between 2017 and 2022, land used to grow vegetables and herbs in greenhouses increased by more than 20 million square feet, an 18 percent jump, according to the federal government’s latest agriculture census, released last month

In New England today, about 20 percent of the leafy greens for sale come from controlled-environment agriculture outfits

A study of 12 indoor farms by the nonprofit Resource Innovation Institute found that five of them used as much energy per square foot as a hospital. One vertical farm, an outlier, was guzzling as much energy per square foot as a data center.

These companies advertise their produce as safer, more nutritious and fresher than field-grown produce, since their operations typically skip pesticides and are within a few hours’ drive of major cities. They boast of using one-tenth of the water, a claim backed up by independent research. But they don’t often talk about their energy use; most states don’t require them to report it, and researchers said many are reluctant to share this data.

In Westbrook, Maine, Vertical Harvest is building a four-story, 52,000-square-foot vertical farm and is negotiating a deal to supply it with renewable energy. However, company leaders said they can’t apply the same strategy to their next project, in Detroit, where the state’s energy mix is heavy on fossil fuels and the company can’t choose its electricity provider.

At a time when consumers are seeking more year-round vegetables and berries, and many still have grim memories of the pandemic’s supply-chain crises, states are courting indoor farms that can be built wherever there’s a market for fresh produce.

Pennsylvania Agriculture Secretary Russell Redding said the state has created a “concierge service” to ease the permitting process and help indoor-farm operators with site selection. His agency is focusing on locations in the Lehigh Valley and the south-central region, where there’s proximity to major energy infrastructure and desirable markets in New York, New Jersey and D.C. Some of the state’s top universities are working on technology to speed automation inside vertical farms and greenhouses, he said, while its colleges are training workers for jobs in these facilities.One of Pennsylvania’s selling points is its abundance of energy, most of which is generated by burning natural gas.“These facilities are energy-intensive,” Redding said, “but Pennsylvania is the second-largest net energy supplier to the nation, and we think that’s a differentiator for us.”

Gretchen Schimelpfenig, a civil engineer who has worked to track indoor farms’ energy use, said many American greenhouses could cut their energy use in half. Dutch greenhouse technology has proved that this is possible, she said, but in the United States, there’s little pressure on indoor food growers to do things differently.

Little Leaf Farms, the dominant controlled-environment producer of packaged greens in New England, uses natural gas to heat its greenhouses. To get around this problem, CEO Paul Sellew said the company buys renewable-energy certificates, each of which corresponds to a set amount of energy generated by cleaner sources such as wind or solar. Little Leaf is also planning to build a large solar array on its 180-acre site in McAdoo, Pa., and Sellew said he’s keen on eventually switching to geothermal energy, which is already being used in the Netherlands to heat greenhouses but hasn’t caught on in the United States.

A few vertical-farm companies, like Texas’s Eden Green, have responded to the problem of dirty energy by focusing on efficiency. Eden Green’s hybrid model uses natural light, and the company lessens the burden on its cooling system by using programmed vents to control heat and humidity. Badrina estimated his two farms use about a quarter of the electricity consumed by a typical vertical farm growing leafy greens, which has allowed the company to plant other crops, such as herbs, that are more energy-intensive.

as some companies look to build vertical farms in the swampy Southeast, Badrina said they are likely to face even higher power bills from all the energy needed to counter the region’s heat and humidity.