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Machines can’t always take the heat − two engineers explain the physics behind how heat waves threaten everything from cars to computers

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Machines can’t always take the heat − two engineers explain the physics behind how heat waves threaten everything from cars to computers

Extreme heat can affect how well machines function, and the fact that many machines give off their own heat doesn’t help.
AP Photo/Abdeljalil Bounhar

Srinivas Garimella, Georgia Institute of Technology and Matthew T. Hughes, Massachusetts Institute of Technology (MIT)

Not only people need to stay cool, especially in a summer of record-breaking heat waves. Many machines, including cellphones, data centers, cars and airplanes, become less efficient and degrade more quickly in extreme heat. Machines generate their own heat, too, which can make hot temperatures around them even hotter.

We are engineering researchers who study how machines manage heat and ways to effectively recover and reuse heat that is otherwise wasted. There are several ways extreme heat affects machines.

No machine is perfectly efficient – all machines face some internal friction during operation. This friction causes machines to dissipate some heat, so the hotter it is outside, the hotter the machine will be.

Cellphones and similar devices with lithium ion batteries stop working as well when operating in climates above 95 degrees Farenheit (35 degrees Celsius) – this is to avoid overheating and increased stress on the electronics.

Cooling designs that use innovative phase-changing fluids can help keep machines cool, but in most cases heat is still ultimately dissipated into the air. So, the hotter the air, the harder it is to keep a machine cool enough to function efficiently.

Plus, the closer together machines are, the more dissipated heat there will be in the surrounding area.

Deforming materials

Higher temperatures, either from the weather or the excess heat radiated from machinery, can cause materials in machinery to deform. To understand this, consider what temperature means at the molecular level.

At the molecular scale, temperature is a measure of how much molecules are vibrating. So the hotter it is, the more the molecules that make up everything from the air to the ground to materials in machinery vibrate.

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When metal is heated, the molecules in it vibrate faster and the space between them moves farther apart. This leads the metal to expand.

As the temperature increases and the molecules vibrate more, the average space between them grows, causing most materials to expand as they heat up. Roads are one place to see this – hot concrete expands, gets constricted and eventually cracks. This phenomenon can happen to machinery, too, and thermal stresses are just the beginning of the problem.

A close-up of a street with several cracks running through the asphalt and a white paint stripe.
Streets crack under heat because higher temperatures create more space between vibrating molecules, causing the material to expand and deform.
Priscila Zambotto/Moment via Getty Images

Travel delays and safety risks

High temperatures can also change the way oils in your car’s engine behave, leading to potential engine failures. For example, if a heat wave makes it 30 degrees F (16.7 degrees C) hotter than normal, the viscosity – or thickness – of typical car engine oils can change by a factor of three.

Fluids like engine oils become thinner as they heat up, so if it gets too hot, the oil may not be thick enough to properly lubricate and protect engine parts from increased wear and tear.

Additionally, a hot day will cause the air inside your tires to expand and increases the tire pressure, which could increase wear and the risk of skidding.

Airplanes are also not designed to take off at extreme temperatures. As it gets hotter outside, air starts to expand and takes up more space than before, making it thinner or less dense. This reduction in air density decreases the amount of weight the plane can support during flight, which can cause significant travel delays or flight cancellations.

Battery degradation

In general, the electronics contained in devices like cellphones, personal computers and data centers consist of many kinds of materials that all respond differently to temperature changes. These materials are all located next to each other in tight spaces. So as the temperature increases, different kinds of materials deform differently, potentially leading to premature wear and failure.

Lithium ion batteries in cars and general electronics degrade faster at higher operating temperatures. This is because higher temperatures increase the rate of reactions within the battery, including corrosion reactions that deplete the lithium in the battery. This process wears down its storage capacity. Recent research shows that electric vehicles can lose about 20% of their range when exposed to sustained 90-degree Farenheit weather.

Data centers, which are buildings full of servers that store data, dissipate significant amounts of heat to keep their components cool. On very hot days, fans must work harder to ensure chips do not overheat. In some cases, powerful fans are not enough to cool the electronics.

A white room filled with large black data servers, which look like lockers.
Data centers, which store large quantities of data, can overheat and require large-scale cooling − which adds to their environmental footprint.
AP Photo/Julie Carr Smyth

To keep the centers cool, incoming dry air from the outside is often first sent through a moist pad. The water from the pad evaporates into the air and absorbs heat, which cools the air. This technique, called evaporative cooling, is usually an economical and effective way to keep chips at a reasonable operating temperature.

However, evaporative cooling can require a significant amount of water. This issue is problematic in regions where water is scarce. Water for cooling can add to the already intense resource footprint associated with data centers.

Struggling air conditioners

Air conditioners struggle to perform effectively as it gets hotter outside – just when they’re needed the most. On hot days, air conditioner compressors have to work harder to send the heat from homes outside, which in turn disproportionally increases electricity consumption and overall electricity demand.

An apartment building wall with closed windows, an AC unit in each.
Heat waves can stress air conditioners, which are already working hard to dissipate heat.
AP Photo/Paul White

For example, in Texas, every increase of 1.8 degrees F (1 degree C) creates a rise of about 4% in electricity demand.

Heat leads to a staggering 50% increase in electricity demand during the summer in hotter countries, posing serious threats of electricity shortages or blackouts, coupled with higher greenhouse gas emissions.

How to prevent heat damage

Heat waves and warming temperatures around the globe pose significant short- and long-term problems for people and machines alike. Fortunately, there are things you can do to minimize the damage.

First, ensure that your machines are kept in an air-conditioned, well-insulated space or out of direct sunlight.

Second, consider using high-energy devices like air conditioners or charging your electric vehicle during off-peak hours when fewer people are using electricity. This can help avoid local electricity shortages.

Reusing heat

Scientists and engineers are developing ways to use and recycle the vast amounts of heat dissipated from machines. One simple example is using the waste heat from data centers to heat water.

Waste heat could also drive other kinds of air-conditioning systems, such as absorption chillers, which can actually use heat as energy to support coolers through a series of chemical- and heat-transferring processes.

In either case, the energy needed to heat or cool something comes from heat that is otherwise wasted. In fact, waste heat from power plants could hypothetically support 27% of residential air-conditioning needs, which would reduce overall energy consumption and carbon emissions.

Extreme heat can affect every aspect of modern life, and heat waves aren’t going away in the coming years. However, there are opportunities to harness extreme heat and make it work for us.The Conversation

Srinivas Garimella, Professor of Mechanical Engineering, Georgia Institute of Technology and Matthew T. Hughes, Postdoctoral Associate, Massachusetts Institute of Technology (MIT)

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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How Nutriset, a French company, has helped alleviate hunger and create jobs in some of the world’s poorest places

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theconversation.com – Nicolas Dahan, Professor of Management, Seton Hall University – 2025-02-25 12:50:00

How Nutriset, a French company, has helped alleviate hunger and create jobs in some of the world’s poorest places

Michel Lescanne, founder and president of the French company Nutriset, holds Plumpy’nut packets in 2005.
Robert Francois/AFP via Getty Images

Nicolas Dahan, Seton Hall University and Bernard Leca, ESSEC

About 19 million children under 5 around the world suffer from severe acute malnutrition every year. This life-threatening condition kills 400,000 of them – that’s one child every 10 seconds.

These numbers are staggering, especially because a lifesaving treatment has existed for nearly three decades: “ready-to-use therapeutic food.”

Nutriset, a French company, was founded by Michel Lescanne. He was one of two scientists who invented this product in 1996. A sticky peanut butter paste branded Plumpy’nut, it’s enriched with vitamins and minerals and comes in packets that require no refrigeration or preparation.

Health care professionals were quickly convinced of its promise. What was harder to figure out was how to manufacture as many packets as possible while cutting costs. In 2008, ready-to-use therapeutic food producers like Nutriset charged US$60 for one box of 150 packets – the number needed to treat one severely malnourished child for the 6-8 weeks needed for their recovery.

In a study we published in the Journal of Management Studies in October 2024, we explained how the international agencies, nongovernmental organizations, activists and for-profit companies involved in the product’s distribution managed to resolve a public controversy over the use of Nutriset’s patent and its for-profit business model.

Contrary to the expectations of activists and many humanitarian NGOs, this for-profit company managed to reduce its prices down to $39 per box of Plumpy’nut packets by 2019 and keep them consistently lower than any nonprofit or for-profit competitors could, all the while enforcing its patent rights.

We interviewed Jan Komrska, a pharmacist then serving as the ready-to-use therapeutic food procurement manager at UNICEF, the United Nations agency for children; Tiddo von Schoen-Angerer, a pediatrician who was leading the access to medicines campaign at Doctors Without Borders, a medical charity; and Thomas Couaillet, a Nutriset executive. We also studied documents issued over the course of a decade to find out why this company’s unusual approach to intellectual property protection was so successful.

Helping franchisees in low-income countries get started

Nutriset and humanitarian organizations disagreed at the start over how to proceed with the production of ready-to-use therapeutic food.

Doctors Without Borders at first accused Nutriset of behaving like a big drugmaker, shielding itself from competition by aggressively enforcing its patents to charge excessively high prices. The nongovernmental organization demanded that Nutriset allow any manufacturer to make its patented packets, without any compensation for that intellectual property.

By 2012, Nutriset had changed course. It had stopped being almost the sole producer of ready-to-use therapeutic food and instead allowed licensees and franchisee partners, chiefly located in low-income countries, to make the packets without having to pay any royalties. It did, however, make an exception for the United States. It allowed Edesia, a Rhode Island-based nonprofit, to become a Nutriset franchisee.

It also provided these smaller producers with seed funding and technical advice.

Nutriset is still the world’s largest ready-to-use therapeutic food producer, we have determined through our research. It’s responsible for about 30% to 40% of the world’s annual production, down from more than 90% in 2008.

There are some other U.S. manufacturers, such as Tabatchnick Fine Foods, but they aren’t Nutriset partners.

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Nutriset produced this video in 2012 to explain the scale of hunger around the world and how its ready-to-use therapeutic food packets can help.

Threatening legal action

At the same time, the company continued to threaten to take legal action against potential rivals located in developed countries that were replicating their recipe without authorization. Usually, cease-and-desist letters were sufficient.

Nutriset implemented this strategy to ward off competition from big multinational corporations that might try to establish their brands in new markets, gaining a foothold before flooding them with imported ultraprocessed food. A big risk, had that occurred, would have been less breastfeeding for newborns and the disruption of local diets.

Nutriset’s strategy of opening access to its patent selectively has enabled UNICEF to double the share of packets it buys from producers located in the Global South.

UNICEF, the world’s biggest buyer of ready-to-use therapeutic food, bought less than one-third of its supplies from those nations in 2011. That share climbed to two-thirds in 2022.

Nutriset’s reliance on local franchisees has helped create over 1,000 jobs in hunger-stricken regions while strengthening the supply chain and reducing the carbon emissions of transportation, according to UNICEF.

Nutriset’s creative patent strategy also helped its partner producers in low-income countries, which include nonprofit and for-profit ventures, compete with large corporations in developed countries by the time its patent expired in 2018.

In this instance, a for-profit company not only managed to keep its prices lower than its competitors, including nonprofits, but used its patent to support economic development in developing countries by shielding startup producers from international competition.

As a result of these successes, we found that nongovernmental organizations eventually stopped criticizing the French company and recognized that high prices were actually not due to Nutriset’s patent policy but rather to global prices of the packets’ ingredients.

In recognition of its contributions and innovation, Nutriset won the U.S. Patent and Trademark Office’s Patents for Humanity Award in 2015.

Offering a cheap, convenient and effective treatment

One of the biggest advantages of ready-to-use therapeutic food is that parents or other caregivers can give it to their kids at home or on the go. That’s more convenient and cheaper than the alternative: several months of hospitalization where children receive a nutrient-dense liquid called “therapeutic milk.”

The at-home treatment works most of the time. More than 80% of the children who get three daily food packets recover within two months.

Severe acute malnutrition deaths remain high because historically only 25% to 50% of children suffering from it get treated with ready-to-use therapeutic food, due to insufficient funding. The treatment programs are run by governments, UNICEF and other international agencies, and NGOs such as Doctors Without Borders.

USAID’s funding role

The U.S. government spent about $200 million in 2024 through the U.S. Agency for International Development on ready-to-use therapeutic food, enough packets to treat 3.9 million children. That’s nearly as much as UNICEF, which treats about 5 million children annually.

It’s unclear whether the Trump administration, which is trying to dismantle USAID, will discontinue its funding of ready-to-use therapeutic food that the U.S. government has purchased exclusively from U.S. manufacturers with U.S.-sourced ingredients.

At a time when the flow of development aid from several wealthy countries is declining, the precedent Nutriset set suggests that humanitarian organizations, by teaming up with international agencies, governments and for-profit companies, can help drive down the costs of saving lives threatened by hunger while increasing the nutritional autonomy of the Global South.

But the funding for ready-to-use therapeutic food and its distribution has to come from somewhere, whether it is from governments, foundations or other donors.The Conversation

Nicolas Dahan, Professor of Management, Seton Hall University and Bernard Leca, Professeur en sciences de gestion, ESSEC

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A hazy legal landscape means people can get high on hemp products, even where pot is prohibited

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theconversation.com – Katharine Neill Harris, Fellow in Drug Policy, Rice University – 2025-02-25 07:38:00

A hazy legal landscape means people can get high on hemp products, even where pot is prohibited

Delta-8 supplements on a shelf at a Texas store.
Sergio Flores/Washington Post via Getty Images

Katharine Neill Harris, Rice University

In Texas, where I live, marijuana has long been illegal. Yet on a busy street in my Houston neighborhood, at least five stores within a half-mile of each other sell cannabis products that promise a strong high.

Texas isn’t alone. Due to a mix of recent legal changes and an uncertain policy landscape, residents in roughly half of American states have easy access to impairing hemp products that bear a strong resemblance to marijuana and are far less regulated.

As hemp sales soar – reaching nearly US$3 billion in 2023 – a number of states are tightening their restrictions, while experts are analyzing the public health implications. That’s why I analyzed hemp policies in all 50 states with some of my colleagues at Rice University’s Baker Institute, where I’m a drug policy fellow.

Marijuana and hemp: Same plant, different policies

Marijuana and hemp are both varieties of cannabis sativa, a plant with many uses that produces thousands of compounds. Among them is the popular intoxicant delta-9 tetrahydrocannabinol, or delta-9 THC.

Hemp is widely valued as an industrial crop, and for most of American history, farmers freely cultivated it. But by the mid-20th century, lawmakers had grown increasingly opposed to marijuana and were concerned by hemp’s similarity to its impairment-causing cousin.

In an effort to permit hemp cultivation while prohibiting production of a psychoactive plant, the Agricultural Marketing Act of 1946 defined hemp as all parts of the cannabis plant with less than 0.3 percent concentration of delta-9 THC by dry weight. Cannabis that exceeded this threshold was considered marijuana.

The 1970 Controlled Substances Act ushered in the modern era of prohibition of marijuana and other drugs. Hemp remained technically legal, but because of its similarity to marijuana, it was listed as a Schedule I drug, alongside heroin and other substances deemed to have a high potential for abuse and no medical value.

Because of hemp’s Schedule I status, the Drug Enforcement Administration tightly regulated its production. But hemp farmers have long argued that these regulations were excessive – and in 2018, Congress agreed. That year, lawmakers passed a farm bill that removed hemp from the Controlled Substances Act and legalized the manufacture and sale of hemp and its derivatives.

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The ABC News affiliate in San Diego reports on the 2018 farm bill from a local perspective.

Crucially, the 2018 bill still defines hemp as all parts of the plant and its derivatives that have less than 0.3 percent delta-9 THC. But it left a loophole: While delta-9 is the most well-known form of THC, it’s not the only one. Other forms of THC, known as THC isomers, have similar effects. These isomers, like delta-8 and delta-10 THC, can be derived from the hemp plant, and like delta-9 THC, they can cause impairment. The 2018 Farm Bill legalized all of them.

In 2023, sales of hemp-derived cannabinoids reached US$2.8 billion. Market growth has been accompanied by a rise in adverse health events. Chemists have expressed alarm at how some hemp products are made, and analyses of commercially available products have found them to contain heavy metals, residual solvents and pesticides.

Given the lax regulatory environment, many public officials now question the lack of guardrails on this burgeoning hemp industry. As a result, officials and governments across the country are now enacting or considering policy changes.

Some states are imposing age and advertising restrictions

In 2023, 11.4% of 12th graders said they had used hemp-derived delta-8 THC in the past year. Easy access to any substance can encourage use, and THC can have negative impacts on the adolescent brain.

While federal law prohibits the sale of tobacco and alcohol to individuals under 21, there is no similar national requirement for hemp. But at least 27 states that permit the sale of hemp-derived products now have minimum age requirements, and several others have pending legislation.

Lessons from the tobacco market also demonstrate that advertising restrictions can reduce the use of legal but potentially harmful products. Most efforts to curtail hemp advertising focus on youth. Sixteen states restrict the use of packaging and marketing materials that may appeal to minors. Meanwhile, federal regulations also limit youth-targeted marketing.

There are fewer restrictions on advertising to adults. The Food and Drug Administration does prohibit using unverified health claims to sell hemp products, but this standard gives the industry plenty of leeway. Hemp ads often tout their purported physical benefits, like reducing pain or improving sleep, or portray them as mood-boosters that can make one feel euphoric and aroused, with few downsides.

Other states are establishing potency limits

The use of products high in THC has been linked to greater risk of cannabis dependence and adverse mental health outcomes. Concerns about product potency have led all states with recreational marijuana markets to limit the amount of delta-9 THC in edible products. This threshold is typically around 10 milligrams, a dose that’s strong enough to affect most people.

Hemp is a different story. To satisfy federal requirements, hemp just has to have less than 0.3% delta-9 THC by weight. This limit sounds low, but the weight-based metric does not account for heavier products, like food and drinks.

For example, a 50-gram candy bar – roughly the size of a Snickers bar – with 150 milligrams of hemp-derived delta-9 THC is legal in the 34 states that don’t have milligram caps on hemp products. This is a dose 15 times higher than what any recreational marijuana market allows. Meanwhile, states that only restrict hemp’s delta-9 content also leave the door open to products with high amounts of other forms of THC.

At least 13 states have responded to potency concerns by adding milligram caps on the total THC permitted in a single serving of a hemp product. Some of these limits are so low – 1 milligram or less in Connecticut, New York, Montana and Rhode Island – that one serving is unlikely to cause impairment.

Enforcement is a wild card

Only regulations that are enforced are effective, and states differ in the level of energy they devote to industry oversight.

In Virginia, the Office of Hemp Enforcement has issued over $12 million in fines to noncompliant hemp retailers since its creation in 2023. On the other end of the spectrum, Massachusetts considers hemp-derived THC products illegal, but it has not provided local jurisdictions with funding for enforcement, resulting in continued availability of prohibited products.

Some states with legal hemp markets have added additional sales taxes to help fund enforcement. In Nebraska, Missouri and Connecticut, attorneys general have sued hemp retailers for selling illegal items, marketing to minors and engaging in deceptive trade practices.

As the hemp industry expands, so will concerns about how to protect public health. The demand for THC, and the market to supply it, continues to grow. If lawmakers want to develop industrywide safety standards or deal with the challenges of online marketplaces that sell hemp products to minors, it will take action from Washington. In the meantime, many states and policymakers are exploring an expansive middle ground between unfettered access and blanket bans.The Conversation

Katharine Neill Harris, Fellow in Drug Policy, Rice University

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Francis − a pope who has cared deeply for the poor and opened up the Catholic Church

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theconversation.com – Mathew Schmalz, Professor of Religious Studies, College of the Holy Cross – 2025-02-24 15:05:00

Francis − a pope who has cared deeply for the poor and opened up the Catholic Church

Pope Francis during the Palm Sunday Mass at St. Peter’s Square on April 2, 2023, in Vatican City.
Antonio Masiello/Getty Images

Mathew Schmalz, College of the Holy Cross

Pope Francis, who remains in critical condition and hospitalized as he battles pneumonia in both lungs, was elected pope on March 13, 2013, after the surprise resignation of Benedict XVI.

Prior to becoming pope, he was Jorge Mario Bergoglio, archbishop of Buenos Aires, and was the first person from the Americas to be elected to the papacy. He was also the first pope to choose Francis as his name, thus honoring St. Francis of Assisi, a 13th-century mystic whose love for nature and the poor have inspired Catholics and non-Catholics alike.

Pope Francis chose not to wear the elaborate clothing, like red shoes or silk vestments, associated with other popes. As a scholar of global Catholicism, however, I would argue that the changes Francis brought to the papacy were more than skin deep. He opened the church to the outside world in ways none of his predecessors had done before.

Care for the marginalized

Pope Francis reached out personally to the poor. For example, he turned a Vatican plaza into a refuge for the homeless, whom he called “nobles of the street.”

A smiling young man, dressed in black, poses for a photo.
The Argentinian Jorge Mario Bergoglio, ordained for the Jesuits in 1969 at the Theological Faculty of San Miguel.
Jesuit General Curia via Getty Images

He washed the feet of migrants and prisoners during the traditional foot-washing ceremony on the Thursday before Easter. In an unprecedented act for a pope, he also washed the feet of non-Christians.

He encouraged a more welcoming attitude toward gay and lesbian Catholics and invited transgender people to meet with him at the Vatican.

On other contentious issues, Francis reaffirmed official Catholic positions. He labeled homosexual behavior a “sin,” although he also stated that it should not be considered a crime. Francis criticized gender theory for “blurring” differences between men and women.

While he maintained the church’s position that all priests should be male, he made far-reaching changes that opened various leadership roles to women. Francis was the first pope to appoint a woman to head an administrative office at the Vatican. Also for the first time, women were included in the 70-member body that selects bishops and the 15-member council that oversees Vatican finances. Shortly before his death, he appointed an Italian nun, Sister Raffaella Petrini, as President of the Vatican City.

Pope Francis holding on to a railing as he greets people.
Pope Francis in St. Peter’s Square on April 18, 2022.
Stefano Spaziani/Mondadori Portfolio via Getty Images

Not shy of controversy

Some of Francis’ positions led to opposition in some Catholic circles.

One such issue was related to Francis’ embrace of religious diversity. Delivering an address at the Seventh Congress of Leaders of World and Traditional Religions in Kazakhstan in 2022, he said that members of the world’s different religions were “children of the same heaven.”

While in Morocco, he spoke out against conversion as a mission, saying to the Catholic community that they should live “in brotherhood with other faiths.” To some of his critics, however, such statements undermined the unique truth of Christianity.

During his tenure, the pope called for “synodality,” a more democratic approach to decision making. For example, synod meetings in November 2023 included laypeople and women as voting members. But the synod was resisted by some bishops who feared it would lessen the importance of priests as teachers and leaders.

In a significant move that will influence the choosing of his successor, Pope Francis appointed more cardinals from the Global South. But not all Catholic leaders in the Global South followed his lead on doctrine. For example, African bishops publicly criticized Pope Francis’ December 2023 ruling that allowed blessings of individuals in same sex couples.

His most controversial move was limiting the celebration of the Mass in the older form that uses Latin. This reversed a decision made by Benedict XVI that allowed the Latin Mass to be more widely practiced.

Traditionalists argued that the Latin Mass was an important – and beautiful – part of the Catholic tradition. But Francis believed that it had divided Catholics into separate groups who worshiped differently.

This concern for Catholic unity also led him to discipline two American critics of his reforms, Bishop Joseph Strickland of Tyler, Texas, and Cardinal Raymond Burke. Most significantly, Carlo Maria Viganò, the former Vatican ambassador, or nuncio, to the United States was excommunicated during Francis’ tenure for promoting “schism.”

Recently, Pope Francis also criticized the Trump administration’s efforts to deport migrants. In a letter to US Bishops, he recalled that Jesus, Mary and Joseph had been emigrants and refugees in Egypt. Pope Francis also argued that migrants who enter a country illegally should not be treated as criminals because they are in need and have dignity as human beings.

Writings on ‘the common good’

In his official papal letters, called encyclicals, Francis echoed his public actions by emphasizing the “common good,” or the rights and responsibilities necessary for human flourishing.

Several people seated in a row watch as the pope washes the feet of one of them.
Pope Francis washes the foot of a man during the foot-washing ritual at a refugee center outside of Rome on March 24, 2016.
L’Osservatore Romano/Pool Photo via AP

His first encyclical in 2013, Lumen Fidei, or “The Light of Faith,” sets out to show how faith can unite people everywhere.

In his next encyclical, Laudato Si’, or “Praise Be to You,” Francis addressed the environmental crisis, including pollution and climate change. He also called attention to unequal distribution of wealth and called for an “integral ecology” that respects both human beings and the environment.

His third encyclical in 2020, Fratelli Tutti, or “Brothers All,” criticized a “throwaway culture” that discards human beings, especially the poor, the unborn and the elderly. In a significant act for the head of the Catholic Church, Francis concluded by speaking of non-Catholics who have inspired him: Martin Luther King Jr., Desmond Tutu and Mahatma Gandhi.

In his last encyclical, Dilexit Nos, or “He Loved Us,” he reflected on God’s Love through meditating on the symbol of the Sacred Heart that depicts flames of love coming from Jesus’ wounded heart that was pierced during the crucifixion.

Francis also proclaimed a special “year of mercy” in 2015-16. The pope consistently argued for a culture of mercy that reflects the love of Jesus Christ, calling him “the face of God’s mercy.”

A historic papacy

Francis’ papacy has been historic. He embraced the marginalized in ways that no pope had done before. He not only deepened the Catholic Church’s commitment to the poor in its religious life but also expanded who is included in its decision making.

The pope did have his critics who thought he went too far, too fast. And whether his reforms take root depends on his successor. Among many things, Francis will be remembered for how his pontificate represented a shift in power in the Catholic Church away from Western Europe to the Global South, where the majority of Catholics now live.The Conversation

Mathew Schmalz, Professor of Religious Studies, College of the Holy Cross

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