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“The lower the concentrations of PM2.5, the fewer people need to see the general practitioner. So improving air quality not only benefits public health, but also ensures the financial sustainability of the social security system.”

The study also found that more tree and grass cover in a neighbourhood was associated with less demand for GP and hospital visits. This was especially true of cities and accords with wider evidence on green space in urban areas.

The World Health Organization already recommends that we have access to 0.5 hectares (1.2 acres) of public green space, about two-thirds the size of a football pitch, within 300 metres of our homes.

The urban forester Cecil Konijnendijk recently suggested a 3-30-300 rule of thumb for urban forestry and urban greening – every citizen should be able to see at least three trees (of a decent size) from their home, have 30% tree-canopy cover in their neighbourhood and not live more than 300 metres from a park or green space.

“Based on these results, we need more, not fewer initiatives, like Barcelona’s Superblocks. Political pressure to reverse urban planning initiatives that reduce air pollution and increase tree cover seem ridiculous.”

In a few short years, effective altruism has become the giving philosophy for many Silicon Valley programmers, hedge funders and even tech billionaires. That includes not just Mr. Bankman-Fried but also the Facebook and Asana co-founder Dustin Moskovitz and his wife, Cari Tuna, who are devoting much of their fortune to the cause.

“If I can help encourage people who do have enormous resources to not buy yachts and instead put that money toward pandemic preparedness and A.I. safety and bed nets and animal welfare that’s just like a really good thing to do,” Mr. MacAskill said.

Mr. Musk has not officially joined the movement but he and Mr. MacAskill have known each other since 2015, when they met at an effective altruism conference. Mr. Musk has also said on Twitter that Mr. MacAskill’s giving philosophy is similar to his own.

Mr. MacAskill was one of the founders of the group Giving What We Can, started at Oxford in 2009. Members promised to give away at least 10 percent of what they earned to the most cost-effective charities possible.

If the movement has an ur-text, it is the Australian philosopher Peter Singer’s article, “Famine, Affluence and Morality,” published in 1972. The essay, which argued that there was no difference morally between the obligation to help a person dying on the street in front of your house and the obligation to help people who were dying elsewhere in the world, emerged as a kind of “sleeper hit” for young people in the past two decades,

Traditionally, effective altruism was focused on finding the lowest-cost interventions that did the most good. The classic example is insecticide-treated bed nets to prevent mosquitoes from giving people malaria.

Mr. MacAskill argues that people living today have a responsibility not just to people halfway around the world but also those in future generations.

The rise of this kind of thinking, known as longtermism, has meant the Effective Altruists are increasingly associated with causes that have the ring of science fiction to them — like preventing artificial intelligence from running amok or sending people to distant planets to increase our chances of survival as a species

The two men first met in 2012, when Mr. Bankman-Fried was a student at M.I.T. with an interest in utilitarian philosophy.

Over lunch, Mr. Bankman-Fried said that he was interested in working on issues related to animal welfare. Mr. MacAskill suggested that he might do more good by entering a high-earning field and donating money to the cause than by working for it directly.

Mr. Bankman-Fried contacted the Humane League and other charities, asking if they would prefer his time or donations based on his expected earnings if he went to work in tech or finance. They opted for the money, and he embarked on a remunerative career, eventually founding the cryptocurrency exchange FTX in 2019.

Bloomberg recently estimated that Mr. Bankman-Fried was worth $10.5 billion, even after the recent crash in crypto prices. That puts Mr. Bankman-Fried in the unusual position of having earned his enormous fortune on behalf of the effective altruism cause, rather than making the money and then searching for a sense of purpose in donating it.

Mr. Bankman-Fried said he expected to give away the bulk of his fortune in the next 10 to 20 years.

Mr. Moskovitz and Ms. Tuna’s net worth is estimated at $12.7 billion. They founded their own group, Good Ventures, in 2011. The group said it had given $1.96 billion in donations

Those two enormous fortunes, along with giving by scores of highly paid engineers at tech companies, mean the community is exceptionally well funded.

Mr. MacAskill said that he got to know Mr. Musk better through Igor Kurganov, a professional poker player and effective altruist, who briefly advised Mr. Musk on philanthropy.

In August, Mr. Musk retweeted Mr. MacAskill’s book announcement to his 108 million followers with the observation: “Worth reading. This is a close match for my philosophy.” Yet instead of wholeheartedly embracing that endorsement as many would, Mr. MacAskill posted a typically earnest and detailed thread in response about some of the places he agreed — and many areas where he disagreed — with Mr. Musk. (They did not see eye to eye on near-term space settlement, for one.)

Mr. MacAskill accepts responsibility for what he calls misconceptions about the community. “I take a significant amount of blame,” he said, “for being a philosopher who was unprepared for this amount of media attention.”

That has made him the most popular influencer among American Gen-Zers, according to a twice-yearly survey of 14,500 of the country’s teenage boys and girls by Piper Sandler, a finance company that researches consumer data. Teachers have reported boys as young as 11 praising and emulating him.