How ‘Sesame Street’ Started a Musical Revolution

Elmo, a very musical Muppet, has been a big part of the evolution of songs on “Sesame Street.”Credit: Vincent Tullo for The New York Times
Elmo, a very musical Muppet, has been a big part of the evolution of songs on “Sesame Street.”Credit: Vincent Tullo for The New York Times
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How ‘Sesame Street’ Started a Musical Revolution

Elmo, a very musical Muppet, has been a big part of the evolution of songs on “Sesame Street.”Credit: Vincent Tullo for The New York Times
Elmo, a very musical Muppet, has been a big part of the evolution of songs on “Sesame Street.”Credit: Vincent Tullo for The New York Times

Fifty years ago, the television show united children’s education, puppetry, and songs. Pop stars have been singing the Muppets’ tunes (and vice versa) ever since.

How many ways can you sing about the letter B? On “Sesame Street,” that question has many furry answers.

Since its inception in 1969, the public television show has redefined what it means to teach children through TV, with music as its resounding voice. Before “Sesame Street,” it wasn’t even clear that you could do that; once the series began, as a radical experiment that joined educational research and social idealism with the lunacy of puppets and the buoyancy of advertising jingles, it proved that kids are very receptive to a grammar lesson wrapped in a song.

Big-name stars lined up to make guest appearances that have become the stuff of legend (Stevie Wonder and Grover; Loretta Lynn and the Count; Smokey Robinson and a marauding letter U). And long before inclusion was a curriculum goal, “Sesame Street” made a point to showcase Afro-Caribbean rhythms, operatic powerhouses, Latin beats, Broadway showstoppers and bebop alongside its notably diverse cast.

“Sesame Street is one of the earliest examples of a musical I experienced,” said Lin-Manuel Miranda, who grew up adoring “I Love Trash” and called its singer, Oscar the Grouch, “a character so singular that he changes the way you see the world at large.”

“I learned from ‘Sesame Street’ that music is not only incredibly fun, but also an extremely effective narrative and teaching tool,” he added in an email. “On top of that, their songs are the closest thing we have to a shared childhood songbook.”

Miranda began composing for “Sesame” not long after his first Tony win in 2008; his friend Bill Sherman, a fellow Tony winner, became the “Sesame” music director the following year. Today, with online viewership in the hundreds of millions, the series still hosts pop superstars — Janelle Monáe, Romeo Santos, Ed Sheeran, Sia, Katy Perry, Bruno Mars — on the updated streetscape where Nina Simone sang “To Be Young, Gifted and Black” in 1972.

Now, as it marks its 50th anniversary — after 4,526 episodes, not to mention specials, movies, albums and more — the legacy of “Sesame” is clear: It impacted the music world as much as it shaped TV history, inspiring countless fans and generations of artists. And the show is still innovating, finding ever more ways to sing out loud.

In the late ’60s, when Joan Ganz Cooney, a television producer, and Lloyd Morrisett, a psychologist and philanthropy executive, set out to develop “Sesame Street,” their aim was to build school preparedness and narrow the educational gap between lower- and upper-income children. They brought in a Harvard professor for pedagogy advice and borrowed from commercial TV to create memorable characters, including Jim Henson’s Muppets.

Research also showed that children were more attuned when they watched with caregivers, so in came the celebrity appearances (on the second episode, James Earl Jones enunciates the alphabet in theatrically sloooow tones) and parodies of songs that mom and dad would know.

The sonic identity of “Sesame Street” had many creators: Jon Stone, the first head writer and a longtime producer and director, helped conceive the theme song, and the writer Jeff Moss (like Stone, an alum of “Captain Kangaroo”) gave us “Rubber Duckie,” “The People in Your Neighborhood” and “I Love Trash.”

But the person most associated with the show’s musical style was its inaugural music director, the classically trained, Harvard-educated composer and jazz pianist Joe Raposo.

In the early years, when “Sesame” did a now unheard-of 130 hourlong episodes a year (it sometimes aired as often as five times a day) Raposo’s output was prodigious: He wrote over 3,000 pieces for the show, original compositions that could range from a few seconds to full-blown production numbers.

“He would receive the cans of film from the office, watch them overnight and score them,” said his son Nick Raposo.

With a pencil and a legal pad, he wrote “everywhere,” his son said, including in taxis, sometimes handing his freshly jotted arrangements off to the music coordinator through the window. The first few seasons were definitely trippy; you could blame the era, or the pace. In those early years, “he was in the studio or on set probably 18 hours a day,” Nick Raposo said. “They would just sleep under the mixing board and wake up and start mixing the next day.”

(Like many of his early “Sesame” compatriots, including Jim Henson, Joe Raposo died young, in 1989, at 51.)

Music on “Sesame” functioned in three ways: as backing tracks for animation and film clips (a lonely orangutan looking for a zoo playmate, say); as live performances by well-known guest artists; and as songs for the human actors and Muppets to sing. Raposo, who loved Jelly Roll Morton and Chopin, fado and klezmer, wrote “C is for Cookie” — Henson originally developed Cookie Monster for snack commercials — and “Bein’ Green,” which took on extra poignancy when it was performed by Lena Horne and later Ray Charles, who told puppeteers that he identified with the song’s message about getting comfortable in your own skin, whatever the shade.

Among the “Sesame” breakthroughs was the belief that — in a show that had characters of different ethnicities living in harmonious urban proximity — the music should be multicultural, too. “Joe really pushed for that,” said Christopher Cerf, a Harvard classmate who joined him at “Sesame” in 1970 and went on to write hundreds of songs over the next 45 years.

And as the “Sesame” universe expanded, it pulled more and more major musical talent into its orbit. The jazz musician Toots Thielemans, who performed with Benny Goodman, Ella Fitzgerald and Charlie Parker, played harmonica on the theme song. Grace Slick provided vocals for animated counting sequences. The guitarist in the first “Sesame” traveling band was Carlos Alomar, who toured with James Brown and then wrote the riff for David Bowie’s “Fame.” Alomar’s replacement, who was 19 or so and showed up at his audition with a Muppet-esque green-tinged Afro, was Nile Rodgers. It was his first real paying gig as an artist.

“Sesame Street” was “part of my musical development,” said Rodgers, the Chic frontman and Grammy-winning producer.

The harmonies were highly sophisticated. “You got to be a real player to play that stuff,” he said. “When we played ‘People in Your Neighborhood,’ it was almost like we were a fusion band.”

Famous Faces in the Neighborhood

The show’s first year set the tone for its mission of social and emotional uplift, with folky guests like Pete Seeger and Odetta. But as “Sesame Street” exploded with attention, the pop firmament rolled in. In 1973, Stevie Wonder arrived as an episode-long musical guest, to teach Grover about vocal dynamics. With his full band on set, he performed “Superstition” live to an audience of children — not professional actors — head-banging and playing maracas in their ’70s acrylics. It quickly became one of TV’s iconic musical moments.

By then, “You really could approach almost anyone and have a shot at getting them to come on,” said Cerf, the longtime songwriter. “And people started to call us, especially celebrities who had just had kids.”

In his first appearance, in 1973, Johnny Cash brought his young son to the taping — and in the ’90s returned with his granddaughter and daughter Rosanne Cash. Throughout the late ’70s and ’80s, the artists that graced the Sesame stoop were a crossover with the Billboard charts: Carly Simon, Linda Ronstadt (doing a mariachi number!), Diana Ross, Paul Simon (upstaged by a little girl), Billy Joel. In the ’90s and 2000s, there was Celine Dion, the Dixie Chicks and Destiny’s Child.

For generations of children watching at home or at school, the message was that even world-famous stars could be accessible. “No one was too big for ‘Sesame Street,’ which made it so cool,” said Patrick Stump, the Fall Out Boy frontman, who credited the show with invigorating his curiosity about music and more. Norah Jones vividly recalled Cab Calloway’s 1981 performance, in white tie and tails, of a Muppet call-and-response “Hi-De-Ho” as “definitely the first time I saw any jazz musicians.”

The show remained committed to spotlighting artists who might not be familiar to mainstream audiences. The jazz percussionist Max Roach appeared in 2000; the Latin queen Celia Cruz in 1987.

And there was always room for classical stars, often repeat visitors. The violinist Itzhak Perlman made several appearances in the ’80s, and still gets recognized from them. Because the show mixed music so seamlessly with other segments, “it became a classical pill that was very easy to swallow,” he said. (Perlman, who has used crutches since he had childhood polio, also took part in an influential 1981 segment that addressed his physical difference.)

Lang Lang, the star pianist from China, began watching the show at 15, when he first came to the U.S. — precisely because he saw people like Perlman on it. He was invited to appear early in his career, and considered it a crossover coup. “Sesame,” he said, connected classical music to kids’ everyday lives, in a way that stripped it of its highbrow connotation.

In his appearance, he went a step further: “I was trying to speak like Elmo, to be funnier.” (The producers, he recalled, told him to just be himself.)

Being on “Sesame” is simultaneously surreal and deeply comforting. If you grew up with it, it’s as familiar as your childhood bedroom — but a fever-dream version, with a cast of adults scooting around the floor on cushioned dollies, staring at monitors while they speak in incongruously high-pitched or gravelly voices that travel out of their perpetually aloft arms.

And yet, guest artists almost instantly forget that there’s anyone inside Ernie or Abby Cadabby. “I knew, of course, it was a puppeteer,” said Jones, of her 2004 bit, spoofing her Grammy-winning “Don’t Know Why” with a song called “Don’t Know Y.” And yet, “I definitely felt like it was Elmo and the letter Y. I could feel, like, his heart beating; it was really like — whoa, he’s real.”

Bursting into tears is also common. Tracy Chapman needed a break to compose herself during her 1998 performance; Gloria Estefan, who connected with Sonia, Luis and Maria, the show’s trailblazing Latino characters, “cried when she walked in, because she said she was able to see herself and identify with somebody on TV,” said Carmen Osbahr, who performed alongside her as the Spanish-speaking Muppet Rosita.

When R.E.M. came on to do “Happy Furry Monsters,” a takeoff on their hit “Shiny Happy People,” they hung around the set all day, adding jokes to their number and watching other segments being produced, said Cerf. “That happened all the time,” the songwriter said. “I was there when Melissa Etheridge came, and she wanted to sit in Big Bird’s nest before she left.”

Harry Styles, the One Direction star, also “had to meet Big Bird,” said Bill Sherman, the show’s music director. “And Will.i.am needed to talk to Grover.”

Like Lin-Manuel Miranda, Chance the Rapper is an Oscar guy. “I always just felt like he was misunderstood,” he said. When he came on to do a theatrical scene with Cookie and Elmo, he also invented a bit for himself and Oscar.

“People are so happy to be on the show that they’ll almost do anything,” Sherman noted, with some glee. “You’re like, ‘stand on your head and count to 10!’ They’re like, ‘sure!’”

In 2009, Carrie Underwood appeared, in voice only, as the character Carrie Underworm, an orange crawler with long blonde hair. The lessons “Sesame” taught “have impacted me in ways that I don’t even realize,” she wrote in an email. “My favorite ‘friends’ on TV were always singing and having fun, and I felt like I was a part of it. That’s a lot of what I try to do as an artist today.”

Chance, too, said “Sesame” affects him even now. The Raposo classic “Sing,” he said, “felt like it was a song telling me not only to just be confident and keep going in all ways, but specifically as an artist to this day, it makes me feel like I should be creating.”

How does a “Sesame” song come to be? It’s started the same way for the last half-century: with a curriculum.

Each year, outside experts outline pressing academic and social issues; from that, and the input of Dr. Rosemarie Truglio, the show’s senior vice president for curriculum and content, an educational theme for the season is built. Episodes can have individual goals, too, and preschool basics like numbers, letters and reading-readiness are perennials.

Then, the scriptwriters step in (“Sesame” writers generally only pen lyrics). “Little kids have short attention spans,” said Christine Ferraro, a “Sesame” writer. “If it’s too talky, you’re going to lose them.”

Ferraro, who started at “Sesame” right out of college as a secretary and has now been a writer and lyricist there for 26 years, is responsible for one of Elmo’s most popular numbers, “Brushy Brush,” a celeb-filled ode to brushing your teeth. It has nearly half a billion YouTube views, and the gratitude of legions of toddler parents.

Cerf is known for his rock parodies: He was behind the Grammy-nominated “Born to Add,” a Bruce Springsteen take-off featuring Bruce Springbean and Cookie as Clarence Clemons on the album cover. (Though “Sesame” normally has its choice of stars, there are some that have remained out of reach. Despite entreaties, the Boss has never appeared. Neither has Madonna, Paul McCartney or the Rolling Stones.)

After a song has lyrics, Sherman and his team score it. Brevity and repetition are key; “Sesame” songs are mostly just verse and chorus, but they’re tuned for catchiness. “You try to make the verse a hook, and then the chorus even more earwormy, if possible,” Sherman said. Demos go to producers and artists for approval and production suggestions, but they must also pass the ultimate litmus test: his two daughters, now 6 and 8.

“They’re very honest, and if they aren’t humming it or singing it, I will usually throw it away and write it again,” he said.

His track record is stellar: “What I Am,” the first song he co-wrote, for Will.i.am, became a viral hit, with more than 88 million views, and won an Emmy. A number for Janelle Monáe, “The Power of Yet” — inspired by her hit “Tightrope,” and written “in my basement in like 20 minutes” — was so convincing that she told him it could appear on her next album. From musicians, said Sherman, that’s “the best compliment I ever get.”

If Sherman doesn’t compose a song himself, he sends it out to his team of seven or eight musicians, a who’s-who of Broadway, movie and pop heavyweights, including Chris Jackson, a star of “Hamilton,” who contributed to something like 100 songs over the last decade; Benj Pasek and Justin Paul, who composed for “La La Land” and “The Greatest Showman;” Jennifer Nettles of the country band Sugarland; and Stump of Fall Out Boy, who will have a recurring, synthy theme song in the 50th season. “Stylistically, it’s so far afield from any stuff I do,” Stump said.

Even for veterans, the curriculum goals — Season 50: “The Power of Possibilities: Embracing Oops and Aha’s”— don’t always make for easy assignments. On the other hand, said Cerf, “You know that if you can’t figure out an ending, you can just have Cookie Monster eat whatever you’re writing about.”

Lookin’ at you: a drawer-full of supplies at the Jim Henson Company studio in Queens, N.Y.CreditVincent Tullo for The New York Times

Composing for a furry creature is its own head trip. “Nothing is more surreal than getting an email with an attached .pdf with the ‘vocal ranges’ of the ‘Sesame Street’ Muppets,” Lin-Manuel Miranda shared. “It’s like receiving a national security briefing.”

The show has endured long enough that children who were reared on its voices are now creating them. When Matt Vogel auditioned to play Big Bird (he took over as the originator, Caroll Spinney, retired), he prepped by listening to a classic Big Bird album — but he also based the vocals on his own memories of the character and the show in the early ’80s. “I still hear the sound effects and the instruments in my head,” he said.

The music and puppeteering also inform each other. Except for Cookie, the Muppets only have four fingers (three fingers and a thumb — because, essentially, it’s cuter, said Jason Weber, creative supervisor at the Jim Henson Company, where all the Muppets are made). When they play instruments, it involves dexterity — Rosita strumming her guitar takes four hands, three of them fur-clad — and imagination.

“Abby plays the guitar lefty, and she can only move her hand in a certain direction, so you have to keep it in this, like, punk vibe,” Sherman said. Whereas Hoots the Owl, a saxophonist, can really wail. One person does his hands and another, his mouth, “so you can nail all these really cool saxophone licks.”

The multi-instrumental Elmo — he plays the violin, piano, drums and more — occasionally has his arms elongated to fit his repertoire. There are Muppet instruments, too, which present their own conundrums: Does a pair of Muppet bongos, for example, have one face or two? And what is the personality of a bongo drum, anyway? These are the workaday conversations that Henson people have with their Sesame colleagues.

“It’s a weird job,” Sherman said, laughing.

What unites the cast and crew is their fervent dedication to the “Sesame” mission. Carmen Osbahr, who grew up in Mexico, recalled learning English from its songs. Mesmerized since childhood, she worked on “Plaza Sésamo,” the Mexican version of the show, and was recruited by Henson and crew to help create Rosita. “The same happiness, sadness — all the feelings that music brings — and everything that ‘Sesame Street’ has to give, I really wanted to be part of it, so I can pass it along,” she said.

Sherman knows the weight of the legacy acutely, and uses it as his spark. “It feels like a relay race, and I’ve been handed a baton,” he said.

“I’ve written hundreds of songs about the letter A, and I’m always trying to get better,” he added. “How can I make a song so that every kid, when they sing this song, all they can think about is the letter A?”



Lonely Tree in Wales Is an Instagram Star, but its Fate Is Inevitable

The Lonely Tree, often pictured submerged in water, was first planted in 2010. (Getty Images)
The Lonely Tree, often pictured submerged in water, was first planted in 2010. (Getty Images)
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Lonely Tree in Wales Is an Instagram Star, but its Fate Is Inevitable

The Lonely Tree, often pictured submerged in water, was first planted in 2010. (Getty Images)
The Lonely Tree, often pictured submerged in water, was first planted in 2010. (Getty Images)

It is one of Wales' most-loved beauty spots - but the time of the so-called Lonely Tree being an Instagram star could be slowly coming to an end.

The birch tree's striking setting at Llyn Padarn in Eryri, also known as Snowdonia, draws photographers to capture the sight through the seasons, according to BBC.

But the local authority Cyngor Gwynedd has raised the prospect of the tree, which was planted around 2010, disappearing within the next decade or so.

A lack of nutrients in the soil means birch trees have “a relatively short lifespan” in the area, typically living for around 30 years, but the fact that The Lonely Tree is sometimes submerged in water means its time could be even shorter.

Thousands of walkers and photographers make their way there each year and the tree has many social media sites dedicated to it, including one with 3,500 members on Facebook.

Marc Lock from Bangor, Gwynedd, said: “The Lonely Tree holds a special place in my heart and that of my family.”

He added: “Nestled down by the Lonely Tree, it's a perfect spot for us to sit, reflect and soak in the breath-taking scenery. We often go paddleboarding there in the summer months.”

However, Lock said the area really became his sanctuary after his wife bought him a camera for Christmas and he took up photography.

It was the place he headed to straight away, and he returns regularly at various times of the day and throughout the seasons.

“It's my go-to spot whenever I have some free time and my camera in hand,” he added. “I can't imagine what I would do if anything devastating happened to it like that at the Sycamore Gap tree at Hadrian's Wall. It's simply unthinkable.”

The Sycamore Gap was a much-loved landmark beside Hadrian's Wall in Northumberland that also drew hikers and photographers from far and wide.

It was more than 100 years old and had been the scene of many proposals, with people making the trip there from around the world.

But it was cut down by vandals in September 2023, causing uproar, with thousands of people leaving tributes and posting messages about their love for the beauty spot.

Two men were jailed for four years and three months after admitting the illegal felling.

While maybe not quite as famous as the Sycamore Gap was, The Lonely Tree is every bit as special to those that hold it dear to their heart.


Four Signs You're Self-Sabotaging Your Joy

Threat or uncertainty can reduce cognitive regulation and increase avoidance behaviors. (Indiana University)
Threat or uncertainty can reduce cognitive regulation and increase avoidance behaviors. (Indiana University)
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Four Signs You're Self-Sabotaging Your Joy

Threat or uncertainty can reduce cognitive regulation and increase avoidance behaviors. (Indiana University)
Threat or uncertainty can reduce cognitive regulation and increase avoidance behaviors. (Indiana University)

Most of us, at some point in our lives, have stood in the way of our own growth.

We make progress on a project, start to feel hopeful about a relationship, or finally get on track with a goal, and then we do something that undermines it.

We fall into a procrastination spiral, pick a fight, or simply quit; in doing so, we talk ourselves out of something that could potentially bring us happiness.

There’s a name for this kind of behavior: self-sabotage.

Dr. Mark Travers, an American psychologist with degrees from Cornell University and the University of Colorado Boulder, wrote an essay at Psychology Today about four well-studied reasons why people sabotage good things, based on research in psychology.

Avoiding blame

According to Travers, one of the most consistently researched patterns in self-sabotage comes from what psychologists call self-handicapping.

He said this is a behavior in which people create obstacles to their own success so that if they fail, they can blame external factors instead of internal ability.

A prime example comes from classic research in which researchers observed students who procrastinated studying for an important test. The ones who failed mostly attributed it to a lack of preparation rather than a lack of organization or discipline.

Self-handicapping is not simply laziness or whimsy. Rather, it is a strategy people use to protect their self-worth in situations where they might perform “poorly” or where they might be perceived as inadequate.

Fear of failure or success

People often think of the fear of failure as the main emotional driver behind self-sabotage.

But research points to the fear of success as an equal, yet less-talked-about engine of the phenomenon. Both fears can push people to undermine opportunities that are actually aligned with their long-term goals.

He said people who worry that failure will confirm their negative self-beliefs are more likely to adopt defensive avoidance tactics, like procrastination or quitting early.

Fear of success, though less widely discussed, operates in a similar fashion. What motivates this fear is the anxiety that comes with the consequences of success.

So, self-sabotaging success can be a way to stay within a comfort zone where expectations are familiar, even if that zone is unsatisfying.

Negative self-beliefs

Self-sabotage is tightly intertwined with how people view themselves. When someone doubts their worth, their ability, or their right to be happy, they may unconsciously act in ways that confirm those negative self-views.

Psychological theories help explain this.

Self-discrepancy theory proposes that people experience emotional discomfort when their actual self does not match their ideal self. This mismatch can lead to negative emotions such as shame, anxiety, or depression.

Coping with stress and anxiety

Self-sabotage often emerges in moments of high stress or emotional threat. When people feel overwhelmed, anxious, or stretched thin, their nervous systems shift into protective modes. Instead of moving forward, they retreat, avoid, or defensively withdraw.

Threat or uncertainty can reduce cognitive regulation and increase avoidance behaviors. In situations of perceived threat, even if the threat is potential success or evaluation, people can default to behaviors that feel safer, even if they undermine long-term goals.


2025 Was the World’s Third-Warmest Year on Record, EU Scientists Say

This photograph taken in Lanester, western France on May 31, 2025, shows smoke rising from a factory. (AFP)
This photograph taken in Lanester, western France on May 31, 2025, shows smoke rising from a factory. (AFP)
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2025 Was the World’s Third-Warmest Year on Record, EU Scientists Say

This photograph taken in Lanester, western France on May 31, 2025, shows smoke rising from a factory. (AFP)
This photograph taken in Lanester, western France on May 31, 2025, shows smoke rising from a factory. (AFP)

The planet experienced its third-warmest year on record in 2025, and average temperatures have ​exceeded 1.5 degrees Celsius of global warming over three years, the longest period since records began, EU scientists said on Wednesday.

The data from the European Union's European Centre for Medium-Range Weather Forecasts (ECMWF) found that the last three years were the planet's three hottest since records began - with 2025 marginally cooler than 2023, by just 0.01 C.

Britain's national weather service, the UK Met Office, confirmed its own data ranked 2025 as the third-warmest in records going back to 1850. The World Meteorological Organization will publish its temperature ‌figures later ‌on Wednesday.

The hottest year on record was 2024.

EXTREME WEATHER EVENTS

ECMWF ‌said ⁠the ​planet ‌also just had its first three-year period in which the average global temperature was 1.5 C above the pre-industrial era - the limit beyond which scientists expect global warming will unleash severe impacts, some of them irreversible.

"1.5 C is not a cliff edge. However, we know that every fraction of a degree matters, particularly for worsening extreme weather events," said Samantha Burgess, strategic lead for climate at ECMWF.

Governments pledged under the 2015 Paris Agreement to try to avoid exceeding ⁠1.5 C of global warming, measured as a decades-long average temperature compared with the pre-industrial era.

But their failure to reduce ‌greenhouse gas emissions means that level could now be ‍breached before 2030 - a decade earlier than ‍had been predicted when the Paris accord was signed in 2015, ECMWF said.

"We are ‍bound to pass it," said Carlo Buontempo, director of the EU's Copernicus Climate Change Service. "The choice we now have is how to best manage the inevitable overshoot and its consequences on societies and natural systems."

POLITICAL PUSHBACK

Currently, the world's long-term warming level is about 1.4 C above the pre-industrial ​era, ECMWF said. Measured on a short-term basis, the world already breached 1.5 C in 2024.

Exceeding the long-term 1.5 C limit - even if ⁠only temporarily - would lead to more extreme and widespread impacts, including hotter and longer heatwaves, and more powerful storms and floods.

In 2025, wildfires in Europe produced the highest total emissions on record, while scientific studies confirmed specific weather events were made worse by climate change, including Hurricane Melissa in the Caribbean and monsoon rains in Pakistan which killed more than 1,000 people in floods.

Despite these worsening impacts, climate science is facing increased political pushback. US President Donald Trump, who has called climate change "the greatest con job", last week withdrew from dozens of UN entities including the scientific Intergovernmental Panel on Climate Change.

The long-established consensus among the world's scientists is that climate change is real, mostly caused by humans, and getting worse. Its main cause ‌is greenhouse gas emissions from burning fossil fuels such as coal, oil and gas, which trap heat in the atmosphere.