VATICAN CITY — Ban Ki-moon arrived at the Vatican with his own college of cardinals. Mr. Ban, the United Nations secretary general, had brought the leaders of all his major agencies to see Pope Francis, a show of organizational muscle and respect for a meeting between two global institutions that had sometimes shared a bumpy past but now had a mutual interest.
The agenda was poverty, and Francis inveighed against the “economy of exclusion” as he addressed Mr. Ban’s delegation at the Apostolic Palace. But in an informal meeting with Mr. Ban and his advisers, Francis shifted the discussion to the environment and how environmental degradation weighed heaviest on the poor.
“This is the pope of the poor,” said Robert Orr, who attended the May 2014 meeting as Mr. Ban’s special adviser on climate change and described the informal conversation with Francis. “The fact that he is making the link to the planet is really significant.”
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On Thursday, Francis will release his first major teaching letter, known as an encyclical, on the theme of the environment and the poor. Given the pope’s widespread popularity, and his penchant for speaking out on major global issues, the encyclical is being treated as a milestone that could place the Roman Catholic Church at the forefront of a new coalition of religion and science.
Francis, the first pope from the developing world, clearly wants the document to have an impact: Its release comes during a year with three major international policy meetings, most notably a United Nations climate change conference in Paris in December. This month, the Vatican sent notifications to bishops around the world with instructions for spreading the pope’s environmental message to the more than one billion Catholics worldwide.
By wading into the environment debate, Francis is seeking to redefine a secular topic, one usually framed by scientific data, using theology and faith. And based on Francis’ prior comments, and those of influential cardinals, the encyclical is also likely to include an economic critique of how global capitalism, while helping lift millions out of poverty, has also exploited nature and created vast inequities.
Vatican officials say that the encyclical is a theological document, not a political one, and have refused to divulge the contents. But there is already much speculation about how Francis will comment on humans’ role in causing climate change, a link he has spoken about in the past. The Vatican’s scientific academy recently attributed climate change to “unsustainable consumption” and called it “a dominant moral and ethical issue for society.”
This stance has rankled some conservative Catholics, as well as climate change skeptics, who have suggested that Francis is being misled by scientists and that he could veer into contentious subjects like population control. Others have argued that papal infallibility does not apply to matters of science. In April, a group of self-described climate skeptics, led by the Heartland Institute, a libertarian group, came to Rome to protest.
Bishop Marcelo Sánchez Sorondo of Argentina, who is also chancellor of the Vatican’s Pontifical Academy of Sciences, has sharply rebutted the criticism and postulated that many of the attacks have been underwritten by oil companies or influenced by conservative American interests, including the Tea Party. “This is a ridiculous thing, completely,” Bishop Sorondo said in an interview at the Vatican.
The first clue of the pope’s interest in the environment came when he chose his name in honor of St. Francis of Assisi, the 13th century friar who dedicated himself to the poor and is considered the patron saint of animals and the environment. Francis had shown interest from his days in Argentina, when he was Cardinal Jorge Mario Bergoglio, the archbishop of Buenos Aires.
There, he played a major role in convening different leaders to seek solutions for Argentina’s social ills. Francesca Ambrogetti, who co-wrote a biography of Francis, said he pushed for scientists at the Pontifical Catholic University of Argentina to investigate the impact of environmental issues on humanity. As far back as September 2004, Cardinal Bergoglio cited the “destruction of the environment” as contributing to inequality and the need for social reforms. At a 2007 meeting of Latin American bishops in Aparecida, Brazil, he oversaw the drafting of a broad mission statement that included an emphasis on the environment.
Pablo Canziani, an atmospheric physicist who researches climate change, said Francis, who had once trained as a chemist, became very interested in the links between environmental destruction and social ills, including a dispute over paper pulp mills on the border with Uruguay, which Argentina claimed were polluting local drinking water.
The pope, Professor Canziani added, has stayed in touch. Last year, the Vatican invited professors at his university to contribute ideas for the encyclical. He said they sent a memo focused on legal issues, sustainability, civic responsibility and governance.
“I’m pretty certain Francis will be requesting a change in the paradigms of development,” he said. “The encyclical will focus on why we’re suffering environmental degradation, then focus on links to social issues.”
The final document seems certain to bear the fingerprints of scientists and theologians from around the world. The Rev. Sean McDonagh, an Irish priest who has worked on environmental issues and climate change for decades, said that Cardinal Turkson contacted him more than a year ago and asked if he would write a comprehensive document about the theological and ethical aspects of environmental issues.
Father McDonagh said he had spent two or three months writing about climate change, biodiversity, oceans, sustainable food “and a section at the end on hope.” Then he sent it to the Vatican. “At the time, they didn’t say there would be an encyclical,” he recalled, adding that he was eager to see it.
“It is man who has slapped nature in the face,” he said, adding: “I think we have exploited nature too much.”
Francis will travel in July to South America, and in September to Cuba and the United States, where he will speak about his encyclical at the United Nations.
“He is certainly going on the road,” said the Rev. Michael Czerny, a Jesuit priest who works under Cardinal Turkson and has been involved in drafting the encyclical. “This is certainly an agenda-setting document.”
Helen Clark, administrator of the United Nations Development Program, said Francis had an “emerging agenda” on social issues and seemed determined “to make his period in office one related to the great concerns affecting humanity.” She added: “He is a man in a hurry.”
Ms. Clark and other development officials can tick off myriad ways that the global poor bear the brunt of environmental damage and changing weather patterns, whether they are African farmers whose crops are destroyed by drought or South Asian farmers threatened by rising sea levels. In this context, Vatican officials say, Francis is likely to see moral injustice.
“Rich people are more prepared,” said Bishop Sorondo, the head of the Pontifical Academy of Sciences. “Poor people are not prepared and have suffered the consequences.”
The May 2014 meeting at the Vatican between Francis and the United Nations delegation came at a propitious moment. The Vatican had just held a major symposium that brought together scientists, theologians, economists and others to discuss climate change and the social impact of environmental damage.
Partha Dasgupta, a member of the Pontifical Academy of Sciences who helped organize the symposium, said many scientists — having dedicated their careers to raising awareness and trying to influence policy — were perplexed at the seeming lack of broad political response. Mr. Dasgupta, an agnostic, said he hoped that Francis could capture public attention by speaking in the language of faith.
“The pope has moral authority,” said Mr. Dasgupta, a prominent expert on development economics and climate change. “It could change the game in a fundamental way.”
