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Farmers are already feeling the pain. About 75% of the water from Lake Mead goes to agriculture.

"With climate change, it seems like the dominoes are beginning to fall," Nasa hydrologist JT Reager told the BBC.

the western United States is now entering one of the worst droughts ever seen.

For many living in California's agricultural heartland, the wells have already started to run dry and they can't afford to dig a deeper well. Charities deliver bottled water and large tanks of non-potable water for washing.

Many farmers argued that it's time for another massive infrastructure project like the Hoover Dam, which was built in the 1930s, so that more rainwater can be stored instead of being let to end up back in the ocean.

Dams are controversial and typically opposed by environmentalists - but with the drought now so severe, even California's Democratic leadership - largely aligned with environmental groups - have proposed rethinking some of the state's shelved dam projects.

Kat George, a manager at Source, was in California's Central Valley where the company is installing hydro-panels on 1,000 homes so people can have clean drinking water.

The financial cost, while vast, is impossible to calculate. In late December, Russia’s Communications Ministry reported that 10 percent of the country’s IT workers had left in 2022 and not returned.

those remaining in the depleted political opposition also faced a choice this year: prison or exile. Most chose exile. Activists and journalists are now clustered in cities such as Berlin and the capitals of Lithuania, Latvia and Georgia.

“This exodus is a terrible blow for Russia,” said Tamara Eidelman, a Russian historian who moved to Portugal after the invasion. “The layer that could have changed something in the country has now been washed away.”

the influx of Russians into countries such as Kazakhstan and Kyrgyzstan, which have long sent immigrants to Russia, set off political tremors, straining ties between Moscow and the other former Soviet states. Real estate prices in those countries have shot up, causing tensions with local populations.

For many Russians choosing to flee, Armenia was a rare easy option. It is one of five ex-Soviet countries that allow Russians to enter with just a national ID — making it a popular destination for former soldiers, political activists and others needing a quick escape.

Given the shared religion and use of language, Russians typically do not face animosity or social stigma in Armenia. Obtaining residency permits is also straightforward, and living costs are lower than in the European Union.

Yerevan has attracted thousands of IT workers, young creatives and working-class people, including families with children, from across Russia. They have established new schools, bars, cafes and robust support networks.

n the courtyard of the “Free School” for Russian children, established in April, Maxim, a construction company manager, was waiting for his 8-year-old son, Timofey. The school started with 40 students in an apartment. Now, there are nearly 200 in a multistory building in the city center.

“I did not want to be a murderer in this criminal war,” said Andrei, who is being identified by his first name for safety reasons

Like the White Russian emigres of the Bolshevik era and the post-Soviet immigrants of the 1990s, many of those leaving Russia because of the war in Ukraine are probably gone for good.

The family has adapted seamlessly to Yerevan. Everyone around them speaks Russian. Maxim works remotely on projects in Russia. Timofey likes his school and is learning Armenian. Maxim said he is sure the family will not return to Russia.

Tanya Raspopova, 26, arrived in Yerevan last March, with her husband but without a plan, overwhelmed and frightened.Then she heard that another emigre was seeking partners to set up a bar, a space where Russian expats could come together, and she wanted to help. Tuf, named after the pink volcanic rock common throughout Yerevan, opened its doors within a month.

They started with a neon-lit bar and kitchen on the ground floor, which soon expanded into a small courtyard. Then they opened up a second floor, then a third. Upstairs there is now a recording studio, a clothing boutique and a tattoo parlor. On a Wednesday night in January, the place was packed with young Russians and Armenians singing karaoke, drinking cocktails and playing ping-pong. “We have since created such a big community, a big family,” Raspopova said. “Tuf is our new home.”

Thousands have chosen the UAE, which did not join Western sanctions and still has direct flights to Moscow, as their new home. Russians enjoy visa-free travel for 90 days, and it is relatively easy to get a national ID, through business or investment, for a longer stay.

The high cost of living means there are no activists or journalists. Dubai is a haven, and the go-to playground, for Russian tech founders, billionaires under sanctions, unpenalized millionaires, celebrities, and influencers.

Shortly after the invasion, conversations in Moscow’s affluent Patriarch Ponds neighborhood turned to the best Dubai real estate deals, said Natalia Arkhangelskaya, who writes for Antiglyanets, a snarky and influential Telegram blog focused on Russia’s elite. A year later, Russians have ousted Brits and Indians as Dubai’s top real estate buyers, Russian-owned yachts dock at the marina, and private jets zigzag between Dubai and Moscow.

Russians can still buy apartments, open bank accounts and snag designer leather goods they previously shopped for in France.

The UAE’s embrace of foreign business has lured a stream of Russian IT workers seeking to cut ties with Russia and stay linked to global markets. Start-ups seek financing from state-supported accelerators. Larger firms pursue clients to replace those lost to sanctions.

About a dozen people arrived to discuss opportunities in India, which has maintained ties with Russia despite the war. Most expressed bitterness about the Kremlin’s politics and a longing for Moscow when it was an aspiring global hub.

“The most important thing for me is to be able to develop international projects and to integrate my kids into a global community, so they grow up in a free environment,”

Andrei works as a delivery driver and shares a modest room with two other men in a shelter set up by Kovcheg, a support organization for Russian emigrants. “Before the war, I never followed politics, but after the invasion, I started reading about everything,” Andrei said. “I feel so ashamed about what Russia has done.”

“Every extra month leads people to get used to a different country,” she said. “They get a job there, their children go to school, they begin to speak a different language. The longer the war lasts — the longer the dictatorship in the country continues — the fewer people will return.”

the expats could become “a repository of relevant skills for a better, freer, modern Russia.” For now, though, Rojansky said, the outflow sends a clear message.

The systems and social media making teenagers sad, angry and afraid today were shaped in part by adults who grew up sad, angry and afraid themselves.

Nearly 1 in 3 high school girls reported in 2021 that they had seriously considered suicide

Teen girls reported the highest ever levels of sexual violence, sadness and hopelessnes

Rates of bullying were increasing in the state even in 2018, and researchers at Drake University found some forms of it significantly correlated with feeling sad or hopeless and attempting suicide.

One in 5 — nearly 53 million people — had a mental illness in 2020, ranging from anxiety to depression to bipolar disorder.

Yes, social media delivers concentrated, addictive stress to developing minds that were held captive by the pandemic. No, logging off TikTok and returning to school will not fix the problem — because each teen’s life ricochets off family, friends and neighbors with struggles of their own in a polity with troubles of its own.

“Increasing the sense among all students that they are cared for, supported, and belong at school” is one, as is growing access to mental health and substance use prevention services for kids and their families and health education classes to teach teens to manage their boundaries and emotions and to ask for help. These positive practices build resilience.

can we acknowledge the weight this puts on underpaid teachers and part-time counselors and nurses? People who, if they haven’t already burned out, are practicing active-shooter drills, catching students up on 18 months of lost learning and ensuring kids have enough food to concentrate in class.

A school’s four walls cannot hold back the trauma of society as well as, perhaps, the personal nightmare waiting for kids at home.

Which brings us to the adults

Solutions start with compassionate, radical honesty: American kids are unwell because American society is unwell.

Nearly 28 million adults had an alcohol use disorder.

As many as 3 in 100 people will have a psychotic episode in their lives

we, too, need a sense that we are cared for, supported and belong.

As kids, 61 percent of adults in the United States experienced abuse or neglect, grew up with poverty, hunger, violence or substance abuse, experienced gender-based discrimination and racism or lost a parent to divorce or death.

If not you, then someone you know is doing their best to stitch up those invisible wounds.

Here’s more hope: Brains wired by toxic stress, such as the sexual violence that 1 in 10 teen girls are facing today, have the ability to essentially heal when exposed to positive experiences.

Good nutrition, adequate sleep, mindfulness practices all help. Adults as well as children have neuroplasticity, and family resilience and connection are positive influences.

But the earlier form of teenage life was physically more precarious — more drinking and driving, more actual sex with actual bodies, more pregnancy, more violence.

Dr. Monteiro and his colleagues developed a food classification system called Nova, named after the Portuguese and Latin words for “new.” It has since been adopted by researchers across the world.

Unprocessed or minimally processed foods, like fresh or frozen fruits and vegetables, beans, lentils, meat, poultry, fish, eggs, milk, plain yogurt, rice, pasta, corn meal, flour, coffee, tea and herbs and spices.

Processed culinary ingredients, such as cooking oils, butter, sugar, honey, vinegar and salt.

If you look at the ingredient list and you see things that you wouldn’t use in home cooking, then that’s probably an ultraprocessed food,”

his group includes freshly baked bread, most cheeses and canned vegetables, beans and fish. These foods may contain preservatives that extend shelf life.

Ultraprocessed foods made using industrial methods and ingredients you wouldn’t typically find in grocery stores — like high-fructose corn syrup, hydrogenated oils and concentrated proteins like soy isolate.

They often contain additives like flavorings, colorings or emulsifiers to make them appear more attractive and palatable.

Think sodas and energy drinks, chips, candies, flavored yogurts, margarine, chicken nuggets, hot dogs, sausages, lunch meats, boxed macaroni and cheese, infant formulas and most packaged breads, plant milks, meat substitutes and breakfast cereals.

Processed foods made by combining foods from Category 1 with the ingredients of Category 2 and preserving or modifying them with relatively simple methods like canning, bottling, fermentation and baking

That has led to debate among nutrition experts about whether it’s useful for describing the healthfulness of a food, partly since many UPFs — like whole grain breads, flavored yogurts and infant formulas — can provide valuable nutrients

Most research linking UPFs to poor health is based on observational studies, in which researchers ask people about their diets and then track their health over many years.

Why might UPFs be harmful?

In a large review of studies that was published in 2024, scientists reported that consuming UPFs was associated with 32 health problems, with the most convincing evidence for heart disease-related deaths, Type 2 diabetes and common mental health issues like anxiety and depression.

Such studies are valuable, because they can look at large groups of people — the 2024 review included results from nearly 10 million — over the many years it can take for chronic health conditions to develop

She added that the consistency of the link between UPFs and health issues increased her confidence that there was a real problem with the foods.

But the observational studies also have limitations,

It’s true that there is a correlation between these foods and chronic diseases, she said, but that doesn’t mean that UPFs directly cause poor health.

Dr. O’Connor questioned whether it’s helpful to group such “starkly different” foods — like Twinkies and breakfast cereals — into one category. Certain types of ultraprocessed foods, like sodas and processed meats, are more clearly harmful than others

UPFs like flavored yogurts and whole grain breads, on the other hand, have been associated with a reduced risk of developing Type 2 diabetes.

Clinical trials are needed to test if UPFs directly cause health problems, Dr. O’Connor said. Only one such study, which was small and had some limitations, has been done, s

In that study, published in 2019, 20 adults with a range of body sizes lived in a research hospital at the National Institutes of Health for four weeks. For two weeks, they ate mainly unprocessed or minimally processed foods, and for another two weeks, they ate mainly UPFs. The diets had similar amounts of calories and nutrients, and the participants could eat as much as they wanted at each meal.

During their two weeks on the ultraprocessed diet, participants gained an average of two pounds and consumed about 500 calories more per day than they did on the unprocessed diet

During their time on the unprocessed diet, they lost about two pounds.

That finding might help explain the link between UPFs, obesity and other metabolic conditions

The Nova system notably doesn’t classify foods based on nutrients like fat, fiber, vitamins or minerals. It’s “agnostic to nutrition,”

There are many “strong opinions” about why ultraprocessed foods are unhealthy, Dr. Hall said. “But there’s actually not a lot of rigorous science” on what those mechanisms are

Because UPFs are often cheap, convenient and accessible, they’re probably displacing healthier foods from our diets

the foods could be having more direct effects on health. They can be easy to overeat — maybe because they contain hard-to-resist combinations of carbohydrates, sugars, fats and salt, are high-calorie and easy to chew

It’s also possible that resulting blood sugar spikes may damage arteries or ramp up inflammation, or that certain food additives or chemicals may interfere with hormones, cause a “leaky” intestine or disrupt the gut microbiome.

Researchers, including Dr. Hall and Dr. Davy, are beginning to conduct small clinical trials that will test some of these theories.

most researchers think there are various ways the foods are causing harm. “Rarely in nutrition is there a single factor that fully explains the relationship between foods and some health outcome,”

In 2014, Dr. Monteiro helped write new dietary guidelines for Brazil that advised people to avoid ultraprocessed foods.

Other countries like Mexico, Israel and Canada have also explicitly recommended avoiding or limiting UPFs or “highly processed foods.”

The U.S. dietary guidelines contain no such advice, but an advisory committee is currently looking into the evidence on how UPFs may affect weight gain, which could influence the 2025 guidelines.

It’s difficult to know what to do about UPFs in the United States, where so much food is already ultraprocessed and people with lower incomes can be especially dependent on them,

“At the end of the day, they are an important source of food, and food is food,” Dr. Mattei added. “We really cannot vilify them,”

While research continues, expert opinions differ on how people should approach UPFs.

the safest course is to avoid them altogether

to swap flavored yogurt for plain yogurt with fruit, for example, or to buy a fresh loaf from a local bakery instead of packaged bread, if you can afford to do so

Dr. Vadiveloo suggested a more moderate strategy, focusing on limiting UPFs that don’t provide valuable nutrients, like soda and cookies

She also recommended eating more fruits, vegetables, whole grains (ultraprocessed or not), legumes, nuts and seeds.

Cook at home as much as you can, using minimally processed foods

Dr. Longo, who is also a professor of gerontology and director of the U.S.C. Longevity Institute in California, has long advocated longer and better living through eating Lite Italian, one of a global explosion of Road to Perpetual Wellville theories about how to stay young in a field that is itself still in its adolescence.

In addition to identifying genes that regulate aging, he has created a plant and nut-based diet with supplements and kale crackers that mimics fasting to, he argues, allow cells to shed harmful baggage and rejuvenate, without the down side of actually starving.

He has patented and sold his ProLon diet kits; published best-selling books (“The Longevity Diet”); and been called an influential “Fasting Evangelist” by Time magazine.

Last month, he published a new study based on clinical trials of hundreds of older people — including in the Calabria town from which his family hails — that he said suggests that periodic cycles of his own faux-fasting approach could reduce biological age and stave off illnesses associated with aging.

“It’s very similar to the original Mediterranean diet, not the present one,” she said, pointing at photographs on the wall of a bowl of ancient legumes similar to the chickpe

“Almost nobody in Italy eats the Mediterranean diet,”

He added that many Italian children, especially in the country’s south, are obese, bloated on what he calls the poisonous five Ps — pizza, pasta, protein, potatoes and pane (or bread).

in recent years, Silicon Valley billionaires who hope to be forever young have funded secretive labs. Wellness articles have conquered newspaper home pages and Fountains-of-Youth workout and diet ads featuring insanely fit middle-aged people teem on the social media feeds of not insanely fit middle-aged people.

he said Italy’s lack of investment in research was a disgrace.

even as concepts like longevity, intermittent fasting and biological age — you’re only as old as your cells feel! — have gained momentum, governments like Italy’s are fretting over a creakier future in which booming populations of old people drain resources from the dwindling young.

many scientists, nutritionists and longevity fanatics the world over continue to stare longingly toward Italy, seeking in its deep pockets of centenarians a secret ingredient to long life.

“Probably they kept breeding between cousins and relatives,” Dr. Longo offered, referring to the sometimes close relations in little Italian hill towns. “At some point, we suspect it sort of generated the super-longevity genome.”

The genetic drawbacks of incest, he hypothesized, slowly vanished because those mutations either killed their carriers before they could reproduce or because the town noticed a monstrous ailment — like early onset Alzheimer’s — in a particular family line and steered clear.

Dr. Longo wonders whether Italy’s centenarians had been protected from later disease by a starvation period and old-fashioned Mediterranean diet early in life, during rural Italy’s abject war-era poverty. Then a boost of proteins and fats and modern medicine after Italy’s postwar economic miracle protected them from frailty as they got older and kept them alive.

At age 16, he moved to Chicago to live with relatives and couldn’t help notice that his middle-aged aunts and uncles fed on the “Chicago diet” of sausages and sugary drinks suffered diabetes and cardiovascular disease that their relatives back in Calabria did not.

He eventually earned his Ph.D in biochemistry at U.C.L.A. and did his postdoctoral training in the neurobiology of aging at U.S.C. He overcame early skepticism about the field to publish in top journals and became a zealous evangelizer for the age-reversing effects of his diet. About 10 years ago, eager to be closer to his aging parents in Genoa, he took a second job at the IFOM oncology institute in Milan.

He found a fount of inspiration in the pescatarian-heavy diet around Genoa and all the legumes down in Calabria.

he also found the modern Italian diet — the cured meats, layers of lasagna and fried vegetables the world hungered for — horrendous and a source of disease.

His private foundation, also based in Milan, tailors diets for cancer patients, but also consults for Italian companies and schools, promoting a Mediterranean diet that is actually foreign to most Italians today.

“Italy’s got such incredible history and a wealth of information about aging,” he said. “But spends virtually nothing.”

He talked about how he and others had identified an important regulator of aging in yeast, and how he has investigated whether the same pathway was at work in all organisms.

Dr. Longo said he thinks of his mission as extending youth and health, not simply putting more years on the clock, a goal he said could lead to a “scary world,” in which only the rich could afford to live for centuries, potentially forcing caps on having children

A more likely short-term scenario, he said, was division between two populations. The first would live as we do now and reach about 80 or longer through medical advancements. But Italians would be saddled with long — and, given the drop in the birthrate, potentially lonely — years burdened by horrible diseases.

The other population would follow fasting diets and scientific breakthroughs and live to 100 and perhaps 110 in relative good health.