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At the Biennale in Venice, a Fantasy Island Imported from Mexico

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At the Biennale in Venice, a Fantasy Island Imported from Mexico

Mexico City’s small urban farms — known locally as chinampas — practice a sort of agriculture in reverse: instead of bringing water to land as most farms do, chinampas bring land to water.

The chinampas in use today go back about a thousand years, to when Aztec farmers began building rectangular fields on top of vast lakes and growing food for what was then the city of Tenochtitlan. There were tens of thousands of chinampas at one point, arranged in strict grids with narrow canals between them, though many were destroyed or abandoned (along with the rest of the Mesoamerican metropolis) after Hernán Cortés and his invading Spanish soldiers rearranged the civic order in 1521.

But working chinampas continue to exist in the southern Mexico City neighborhood of Xochimilco — despite continuing encroachment by developers and competition from factory farms — operating mostly as family businesses that produce heirloom lettuce, radishes, dahlias and other crops. Lately, the farms’ irrigation-friendly ways are getting fresh attention in a world rocked by climate change and suffering from widespread droughts.

Could other places around the globe borrow the idea of creating “floating islands,” as the fields are sometimes called, which are engulfed by water? A team of Mexican designers, landscapers and farmers believes the ancient technology may be widely adaptable, enough that they will recreate a chinampa for their country’s pavilion at this year’s Architecture Biennale in Venice.

“Chinampas have a simple and intelligent design, created in a collective way that benefits not only people but all of the surrounding living beings, too,” said Lucio Usobiaga, a team member who has spent the last 15 years defending the remaining chinampas through a nonprofit he founded called Arca Tierra.

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Mexico’s pavilion is a neat fit for the biennial’s main exhibition, “Intelligens. Natural. Artificial. Collective,” which is intended to show design projects that address climate change in creative ways. The chinampas are at once man-made and organic and can succeed only if there is cooperation among farmers, policymakers and the growing number of tourists who float through on popular canoe tours, gazing at fields of corn and flocks of egrets and pelicans.

Promoting the chinampa as an inspiration for eco-friendly design was an obvious choice for the biennale, team members said. “Venice is also built on water and has the same kind of vulnerabilities that Xochimilco has,” noted Ana Paula Ruiz Galindo, a founder of the design firm Pedro y Juana.

They pointed out that Venice and Xochimilco were added to the list of UNESCO World Heritage sites in the same year, 1987, and both places are island communities navigable by boats and working to balance the positive and negative aspects of tourism.

Venice has its iconic gondolas, while Xochimilco has its trajineras, flat-bottomed vessels, decorated in bright colors and fake flowers that take visitors on party-themed excursions. Both boats are operated by pilots who push them along channels using long poles.

As for how to recreate a chinampa on-site, that took some imagination. And compromise.

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The Aztecs constructed their islands over time, using reeds and branches to make fences in the mucky lake bottom. These formed boundaries for multiple layers of sediment and decaying vegetation (and sometimes human sewerage) until the islands rose far enough above water to be farmed. In addition to growing crops like corn, beans and squash — using the traditional milpa agricultural method that naturally preserves nutrients in soil — they planted trees on the corners of the islands to stabilize the land.

Mexico’s pavilion, inside the biennale’s Arsenale complex, will feature a stripped-down version, much smaller than the 500 square meters (0.12 acres) of a typical chinampa. The exhibition will be enhanced by videos produced in Mexico City featuring real chinamperos, as the farmers are called, and bleachers will be installed along the walls. Artificial lighting will replace sunshine.

In the center will be a working garden planted with vegetables, flowers and medicinal herbs. (The crops were started in an Italian nursery and transferred to the Arsenale by boat in mid-April.) They will mature during the biennale, which continues through Nov. 23.

“By the end of the biennale, we will be able to harvest corn and make tortillas,” said Mr. Usobiaga. “Before that, we can harvest beans, squash, tomatoes and chiles.”

Visitors will learn about special seed cultivation techniques that are unique to chinampas and will have the chance to plant seedlings themselves.

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In a nod to local agriculture, the chinampa will also employ a version of vite maritata, a practice established in ancient Etruscan agriculture that calls for planting grapes around trees, which serve as a natural trellis system for the vines. The exhibition team sees a link between the two forms of agro-forestry, combining trees and crops into one ecosystem.

“We are going to see this dialogue between two ancient cultures that both have a lot to say about how we can move forward,” Mr. Usobiaga said.

The exhibition team members said they wanted to be careful not to overly romanticize chinampas because they are not easy to duplicate on a scale that could feed a large population today. The farms work in Mexico City because they sit on a lake that lacks an outlet to another body of water, making water levels relatively easy to control. The opposite is true, of course, in Venice, which is on a lagoon close to the sea and always under threat from flooding.

Also, the economics of small farms — high production costs, low yields because of their size — make it difficult to turn a profit. Farmworker wages are generally too low to support people in urban areas, and the backbreaking work of planting and harvesting has lost prestige.

“This is a big problem here, that people, especially young people, don’t want to work the soil on chinampas anymore,” said María Marín de Buen, the team’s graphic designer.

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Even in Xochimilco, many chinampas lie fallow because their owners cannot make a living. Some have been turned into soccer fields, which are rented out to the community; others are event venues where people celebrate weddings or birthday parties. Officially, the land is restricted from development, as well as from cattle grazing and the hunting of endangered animal species, though these things happen with alarming frequency.

Still, the team sees something inspirational at play: a connection between nature and the built environment, between existing water resources and the need to construct houses and schools. Architects who visit the biennale may not go on to design large swaths of farmland, but they can replicate the idea on a smaller scale using whatever conditions exist, said Jachen Schleich, a team member who is a principal of the Mexico City architectural firm Dellekamp + Schleich.

“Even if somebody does this in his backyard, he can at least feed his family, or the people on the four floors of his building, Mr. Schleich said. “It could be like a micro-intervention in the landscape or a public space.”

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More middle-class Californians cancel health coverage after losing federal aid

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More middle-class Californians cancel health coverage after losing federal aid

Facing higher premiums and the loss of federal subsidies, 374,000 people with health insurance from the state marketplace known as Covered California canceled their coverage in the first three months of the year, according to government statistics.

The cancellations amount to 19% of those who had renewed their policies on the state marketplace during open enrollment, state officials said. Those cancellations are higher than in the past three years when they ranged from 13% to 15% of those who renewed.

Jessica Altman, executive director of Covered California, attributed the jump in cancellations to the expiration of enhanced federal subsidies that caused the cost of a plan to leap for most middle-class Californians.

“We expect coverage losses to increase through the year,” she said.

Overall, Covered California had 1.8 million enrollees in February, down from 1.94 million the year before — a decline of 7%.

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Altman said monthly enrollment numbers are delayed because consumers have a three-month grace period to resume their premium payments before the insurance carriers end their coverage for nonpayment.

This year, many middle-class Californians who depend on the state-run insurance marketplace created under the Affordable Care Act faced annual costs that were hundreds of dollars higher than last year because of the end of enhanced federal subsidies that began during the COVID-19 pandemic.

In 2021, Congress voted to temporarily boost the amount of subsidies Americans could receive for an ACA plan.

The law also expanded the program to families who had more money. Before that 2021 vote, only Americans with incomes below 400% of the federal poverty level — currently $62,600 a year for a single person or $128,600 for a family of four — were eligible for ACA subsidies. The 2021 vote eliminated the income cap and limited the cost of premiums for those higher-earning families to no more than 8.5% of their income.

On top of the loss of the enhanced federal subsidies, the average premium charged by insurers this year for a Covered California plan rose by more than 10% because of fast-rising medical costs.

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The decline in ACA plan enrollees, however, has been greater in some other states. California has tried to keep people insured by using state tax money to fill in the gap for lower-income families.

This year, the state budgeted $190 million for premium subsidies for people with incomes of up to 165% of the federal poverty level.

In his budget plan, Gov. Gavin Newsom proposed spending $300 million on those state subsidies in 2027. That would expand the subsidies to enrollees with incomes up to 200% of the federal poverty level, or $31,920 for an individual or $66,000 for a family of four.

“We may actually see a number of Covered California enrollees paying less in 2027” because of the additional state subsidies, Altman said.

In May, Newsom also proposed in his budget that an additional $27 million in state money be used to help enrollees pay for the cost of gender-affirming care. That amount is an increase to the $30 million that he earlier proposed be spent this year and next to defray those costs for Covered California enrollees, according to state officials.

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Last year, federal health officials enacted a rule that said the federally subsidized ACA plans could no longer cover gender-affirming care because it was no longer considered an “essential health benefit.”

Newsom’s proposed budget still faces debate in Sacramento and approval by the state Legislature.

The state marketplaces, created by the Affordable Care Act, also known as Obamacare, were meant to help those who don’t have access to an employer’s health insurance plan and have incomes too high to qualify for Medi-Cal, the government-paid insurance for the poor and disabled.

Because of the higher cost this year, more people are choosing the lower-priced Bronze plans. Those plans have higher co-pays and deductibles than the more expensive plans.

“We’re very concerned with the large shift to Bronze,” Altman said. “When you have higher cost-sharing, you’re more likely to defer care.”

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Political play or budget fix? Competition for JPL’s management comes at a fraught moment

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Political play or budget fix? Competition for JPL’s management comes at a fraught moment

Weeks after Trump administration officials announced that management of NASA’s Jet Propulsion Laboratory would open to competitive bidding for the first time, questions remain as to why Caltech could lose control of the lab its researchers founded in 1936.

On one hand, observers note, high-profile delays and cost overruns on significant recent JPL projects earned sharp criticism from NASA even before the 2024 presidential election.

On the other, the second Trump administration’s record of squeezing scientific funding and attacking institutions in Democrat-led states make it difficult to consider any action separate from the charged political atmosphere, analysts say.

“My first instinct is that this [competition] isn’t necessarily a bad thing. It’s not written in stone that Caltech must run JPL, and it wouldn’t be the worst thing to have some competition for running the place,” said Casey Dreier, chief of space policy at the non-profit Planetary Society.

“That said, that requires this contract evaluation to be fair and unbiased, and this administration has no credibility in such things,” he added. “The responsibility is on NASA to earn the trust and ensure such an evaluation is open and free from political meddling. That’s almost impossible.”

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JPL became part of NASA when the space agency was formed in 1958, and Caltech has been awarded the contract to run the institution outright ever since.

Its current 10-year contract with NASA, which is valued at up to $30 billion, runs through Sept. 30, 2028.

NASA Administrator Jared Isaacman announced the competition on May 22 as part of a slate of sweeping organizational changes at the space agency.

“When you step back, it is worth considering how many additional missions we could have undertaken with the resources lost to program cancellations and cost overruns over the years,” Isaacman wrote in a memo to staff. “That is the problem we must fix, so the American taxpayer and space-loving community can receive the highest scientific return on every dollar we spend at NASA.”

Competing the contract for JPL, the lone Federally Funded Research and Development Center (FFRDC) in NASA’s portfolio, was an effort to address cost-efficiency concerns, Isaacman wrote.

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“This process will take several years, and I do not anticipate it having any impact on the projects underway or the location of the facilities,” he wrote. “It does, however, provide an opportunity to evaluate management costs, overhead burdens, and ideally find ways to get after the science faster and more affordably.”

In a joint statement, Caltech President Thomas F. Rosenbaum and JPL Director Dave Gallagher said the competition was “no surprise” and that a team was already in place “to ensure we are positioned for success.”

In July, NASA’s Office of Procurement held an informational event for companies and institutions interested in the upcoming FFRDC contract.

The dozens of registered attendees included universities like USC, Texas A&M University and Georgia Tech, aerospace companies such as Boeing and Lockheed Martin and nonprofit corporations like MITRE, which manages several FFRDCs, and Universities Space Research Association, a university consortium founded by the National Academy of Sciences in 1969. (SpaceX, which has been awarded more than $13 billion in NASA contracts in the last decade, was not on the list.)

“Lockheed Martin has more than 50 years of deep space exploration success with JPL, supporting landmark missions to Jupiter, Venus, Saturn, Pluto, including nearly a dozen missions to Mars,” said Bob Behnken, VP of Exploration and Technology Strategy. “We look forward to building on that unmatched partnership in the years ahead. We are closely following NASA’s review and will continue to assess how we can best contribute to the agency’s mission.”

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Other attendees contacted by The Times declined to discuss their involvement.

Isaacman indicated that JPL could come under scrutiny even before he took over NASA. The billionaire entrepreneur referenced high costs at the La Cañada Flintridge institution in a memo prepared in advance of his confirmation hearings on his priorities for the space agency.

“Contract structure: Very expensive,” Isaacman wrote of JPL in a table outlining organizational issues at each of NASA’s centers. “Must increase the output and ‘time-to-science’ KPI.”

The institution has recently suffered a number of high-profile management stumbles.

After the JPL-managed Psyche mission to a metal-rich asteroid failed to meet its 2022 launch date, NASA commissioned an independent review that said internal reorganizations and personnel changes created distracted and uninformed managers and burned-out, stretched-thin staffers.

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After a 2023 independent review found there was “near zero probability” of the JPL-managed Mars Sample Return mission making its proposed 2028 launch date, and “no credible” way to bring rocks back from the Red Planet within the stated budget, Isaacman’s predecessor Bill Nelson put out a call for proposals to industry and all other NASA centers, forcing JPL to compete for its own project.

After Trump’s election, Nelson announced that the final decision would be in the next administration’s hands.

The White House pushed for massive cuts to NASA’s 2026 budget that Congress overturned, and has lobbied for similarly steep cuts again this year. JPL has instituted painful cost-cutting measures of its own, reducing staffing from roughly 6,500 employees in 2023 to 4,500 last year through layoffs and attrition.

Its struggles come at a point when NASA is enthusiastically embracing private industry. Last month the agency awarded several key contracts for its upcoming lunar missions to Jeff Bezos’s Blue Origin and other private companies.

Trump has also made no secret of his willingness to punish states that haven’t voted for him through job losses. In announcing his decision to move U.S. Space Command from Colorado to Alabama, Trump acknowledged that his loss in Colorado in three presidential elections played a part in the move.

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It’s impossible to consider any decision on JPL’s future separate from the administration’s track record of politically-motivated decisions, Dreier said.

“At the heart of this is why? Why now? If this is not just some rank political attack on California, what do they hope to gain from this?” Dreier said. “That deserves explanation, because the administration otherwise has no credibility here.”

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Dive Into a Very Noisy Sea With Some Very Rare Whales

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Dive Into a Very Noisy Sea With Some Very Rare Whales

The Gulf of Mexico, which the Trump administration calls the Gulf of America, is one of the noisiest bodies of water in the United States. Air gun blasts are the loudest element there, according to research by scientists who monitor underwater acoustics. Shipping traffic is another major contributor.

The noise could affect the ability of Rice’s whales to find food and mates, scientists say. The chronic stress of living in a loud environment could be detrimental to their health.

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