This story was produced by Grist and co-published with USA Today.

This story is part of State of Emergency, a Grist series exploring how climate disasters are impacting voting and politics.

Summertime heat in the United States has always put human health at risk. But the past few years have marked a departure from the historical norm — and the beginning of a new, far deadlier era. Last year was the hottest year registered globally since recordkeeping began in the mid-1800s. In the northern hemisphere, scientists estimate that it was the hottest summer in the past 2,000 years. The summer of 2024, which has already set records, could be even hotter. In early July, about 140 million people — approximately 42 percent of the American population — were simultaneously under some kind of heat alert.  

The record temperatures are more than an uncomfortable inconvenience. Heat waves fill emergency rooms with heatstroke victims, kill agricultural workers picking produce in America’s countryside, overwhelm older adults in unairconditioned apartments, endanger children and pregnant people, melt asphalt and rail tracks, and ground 400,000-pound airplanes. The heat poses an existential threat, one that will grow more pronounced as we make our way deeper into the 21st century. 

Once a month, roughly a dozen people enter a Zoom room to talk about what to do about this. They log on from their desks in Los Angeles, Phoenix, Jacksonville, San Antonio, and other cities across the country that are grappling with scorching temperatures. They have backgrounds in public health, nonprofit work, government, and corporate sustainability. For an hour, this motley brigade of municipal officers — government officials who respond to extreme temperatures in their respective cities — share stories, tips, and warnings from across the country. 

“They can just be really open with one another,” said Rae Ulrich, senior director of a climate resilience collaboration initiative housed at Arizona State University called Ten Across (10x), which organizes the monthly meetings. “They can share their vulnerabilities, major issues they have, they can learn from each other.” 

The sharing of knowledge among local government personnel sounds mundane, but these people have taken on an unprecedented responsibility. City governments across the country rarely have someone dedicated exclusively to the issue of heat, despite the fact that dense, urban centers bear the brunt of extreme warmth. Public health departments have historically shouldered the task of issuing warnings and advisories when heat waves descend, but there is no codified response to the crisis — no tested playbook to follow or federal agency to turn to in the event of an emergency. The Federal Emergency Management Agency, or FEMA, has never responded to a heat wave as a major disaster. The agency has said that heat could technically qualify as such an event, but there is still no criteria governing how it responds or doles out aid.

In 2021, the Atlantic Council’s Adrienne Arsht-Rockefeller Foundation Resilience Center, a Washington, D.C.-based think tank that aims to provide 1 billion people globally with the tools to become more resilient to climate change by the end of the decade, offered Miami-Dade County a matching grant to appoint the world’s first chief heat officer. Since then, the organization has helped establish more heat officers around the globe, including positions in Mexico, Bangladesh, Greece, and Sierra Leone. In the U.S., there is now a chief heat officer in Phoenix, in Los Angeles, and, as of this year, in Arizona — the first-ever such position covering an entire state. 

The officers come up with proposals to help cities adapt to extreme temperatures: tree-planting campaigns, reflective rooftops, spongy urban gardens to replace heat-trapping concrete. They design hand-held fans that have health recommendations written on them, distribute information about upcoming heat waves, and communicate with the public about the myriad risks of high heat. They know how to bridge political divides within communities. To Republicans, they talk about the economic toll of extreme heat. With Democrats, they talk about health impacts. They serve as internal advocates for the people suffering the worst impacts of heat by working across city agencies to create emergency plans for when the next heat wave descends — where and when to open cooling centers and hydration stations, the fastest way to inform the public about health risks, and what to do when emergency rooms reach capacity. They educate city officials who might not know that heat is the number one weather-related killer in the U.S

Soon, heat officers began collaborating with other positions with similar mandates — chief resilience and sustainability officers in New York, Maryland, Louisiana, and Alabama, appointed by mayors or mandated by city climate change plans. Often, these climate leaders were working in a silo. “Because extreme heat created this noise,” said Marta Segura, the chief heat officer for the city of Los Angeles, “it created this groundswell to address extreme heat across these positions that are very similar.” 

As summers have gotten hotter, the weight of responsibility the officers feel has also grown. “It’s a lot to bear,” said Doug Melnick, chief sustainability officer in San Antonio, Texas. “We’re the ones thinking about what’s happening, what the impacts are going to be, and what to do about it.”

But there’s a problem. The vast majority of the officials working on this issue, who are appointed rather than elected, have no authority to actually put the measures they develop into place or require their respective governments to adhere to the recommendations they develop. It’s a searing irony: America’s chief heat officers, and the other types of officers who also work on heat issues, hold the key to protecting communities from rising temperatures, but there is absolutely no guarantee that mayors, governors, and lawmakers will listen. And, in most cases, their funding depends on the political priorities of the party in power. 

“There’s very little authority behind these positions,” said Richard C. Keller, a historian of medicine at the University of Wisconsin-Madison who wrote a book about extreme heat in Europe. “They can issue recommendations, they can help establish policy, but they’re going to have a very hard time enforcing those policies.” It’s a sentiment echoed by other close observers of the response to extreme heat in the U.S. “They just don’t have power,” said Jeff Goodell, author of a seminal book on the health impacts of heat and heat politics called The Heat Will Kill You First. “What they can do is very limited.”

The fact that extreme heat, driven by human-caused climate change, is creating a slow-moving public health disaster across wide swaths of the United States should, in theory, spur immediate, bipartisan action. After all, heat does not recognize state lines or political identity — and it kills indiscriminately. Recorded fatalities from heat have been rising nationwide in recent years. Officially, extreme temperatures were a factor in 2,300 U.S. deaths last year, a record. But the frustrating reality is heat-related mortality is almost always vastly undercounted. No official figure comes close to capturing the actual public health impact of extreme heat because it is rarely registered as a cause of death by medical examiners. Despite myriad indications that the health repercussions of extreme heat are exacting an increasingly deadly toll, mounting a coordinated response to extreme heat in a country where everything is politicized has proven complicated.

a woman stands at a podium with a microphone while talking
Miami-Dade County Chief Heat Officer Jane Gilbert speaks during a news conference in May 2023.
Wilfredo Lee / AP Photo

Jane Gilbert, the first chief heat officer in the U.S., has been working to make Miami-Dade County more resilient to heat for three years now. Her policy prerogatives are at odds with the political priorities of her state’s Republican governor, Ron DeSantis. In her position, Gilbert has advocated for policy measures that protect the county’s most vulnerable, including local legislation that requires better protections for people who work outside — from farmers to construction crews to mail carriers. “It’s that outdoor worker, it’s that person who can’t stay cool at home, it’s that person who has to wait at a bus stop for an hour that is not safe,” she told NBC News in March

A month later, DeSantis signed legislation approved by the Republican-controlled state Senate that prevents local governments from requiring employers to implement heat protections for their workers. “There was a lot of concern coming out of one county — Miami-Dade,” DeSantis said of the local initiatives that sought to require mandatory water breaks and other measures to protect workers from heat. 

“How much authority is a chief heat officer in Miami or Palm Beach going to have over a governor who is basically banning mandatory heat breaks for outdoor workers?” asked Keller, the historian.  

A different story is playing out in California, where Marta Segura, the chief heat officer for the city of Los Angeles, is making recommendations in a political landscape friendly to climate action. There, the groundwork for more aggressive protections against extreme temperatures were laid in 2006, when the state passed heat standards for outdoor workers — the first state in the nation to do so. This summer, a California state board voted to establish similar standards for indoor workers, like warehouse employees and kitchen staff, many of whom also toil in dangerous temperatures all day. California is one of only three states in the U.S. to put such protections in place. Segura has a team of people who work with her under a million-dollar budget — not a huge amount of money, but a sum she puts to good use in her efforts across the city. Even so, Segura, when asked, did not say she has authority within the city government. “I would call it more political influence,” she said. “I see myself as an internal advocate.” 

A woman stands selfie-style in front of a red and white bus stop poster with the header 'avoid heat stroke'
Los Angeles Chief Heat Officer Marta Segura takes a selfie in front of a bus shelter poster on avoiding heat stroke in South Los Angeles.
Courtesy of Marta Segura

Catherine Wallace, the associate director of strategic partnerships and advocacy for the extreme heat resilience pillar of Arsht–Rockefeller’s Resilience Center, told Grist that the heat officers “have all been incredibly effective” in their roles thus far. “Like any government employee, they will face some limitations like budget and team capacity,” she said. 

They are also constrained by the political parameters at play in their respective counties and states. No politician, even in the bluest states, has committed to a political agenda aggressive enough to fully protect the public from worsening extreme heat. “You don’t see the mayor of Phoenix, for example, coming out and saying ‘I’m going to do everything I can to make sure there are no heat deaths in Phoenix in 2024’,” Goodell said. “Instead we have chief heat officers who are sending out emails and holding meetings and trying to do their best.” 

Research shows there is a limit to what the human body can bear. When high temperatures meet high humidity, and those conditions persist for days at a time, people tend to die en masse. Study after study has indicated that these types of mass mortality events could occur with regularity later this century, but isolated instances have already taken place.

In 2003, for instance, a series of heat waves descended on Europe and killed some 70,000 people. In Paris, the worst of the heat occurred in August, when half the city, including nearly every person in a position of power, was away on vacation. Hotels were closed, restaurants shuttered, even some hospitals shut down for the holiday period. As the heat built over the first week of August, no politician made a pronouncement or issued an alert about the heat. 

On August 10, the head of the Paris Emergency Physicians Union went on television and informed the public of the crisis unfolding in emergency rooms across the city: Hundreds of bodies were piling up — all victims of the heat. Funeral directors were running out of room in their morgues. There was a horrible stench in apartments where older adults died, alone, while their families were vacationing. By the end of September, an official report came out that took stock of what had happened. It found that in the first 20 days of August, there had been 15,000 excess deaths in France. “There was this incredible shock then,” Keller, who wrote a book about the catastrophe, said. “There was a sense of, ‘How could this country with the best public health system in the world, the country that invented the notion of humanism and human rights — how could we have let this happen?’” 

The political backlash was swift: The director general of public health in Paris was fired and later, the national minister of health later lost his job, too. National officials also established a series of measures — from requiring air conditioning in retirement homes to issuing heat alerts to the public before temperatures spike to ensuring adequate personnel coverage in hospitals during summer vacations — that are still in place today. 

A man wearing a suit wheels a large brown wooden coffin into a room where similar-looking light-wooden coffins are stacked vertically.
Coffins at an undertaking company in August 2003 in Aubervilliers, France.
Pascal Le Segretain / Getty Images

Contrary to France, it is unlikely that a time will ever come when extreme heat is apolitical in the U.S. “It’s become politically anathema on the right to say that heat is dangerous because it’s tied so closely to climate change,” Keller said. “There’s every incentive to trivialize it.” This summer, the federal Occupational Safety and Health Administration, or OSHA, unveiled a proposal that would require employers to provide breaks and water for their employees. A top Republican lawmaker said OSHA’s proposed rule was “one of the most idiotic things they’ve ever done.” 

In the U.S., science rarely trumps political intractability. But money can often do what climate projections cannot. 

Ulrich, with 10 Across, said that FEMA recently agreed to engage in an emergency scenario exercise with the officers in the Ten Across network. The goal of the exercise is to “help local governments determine process flow and coordination with FEMA before, during, and after extreme heat events.” One of the reasons why FEMA has been slow to respond to heat waves is that heat, unlike hurricanes or flooding, rarely causes widespread physical damage to infrastructure. It’s hard to write a check for heat — its toll is largely invisible. But as temperatures rise, the costs of confronting heat will also increase. Hospitals will reach capacity, morgues will overflow, cars will overheat, roads will melt, train tracks will swell and warp. FEMA’s participation in the emergency scenario exercise suggests that the agency is willing to engage with heat officers as it mulls over how to reimburse states for losses incurred during heat waves. 

“As with all severe weather events, FEMA works with communities on a case-by-case basis,” an agency spokesperson told Grist. “If there were to be a scenario where an extreme heat incident potentially exceeded state and local capacity, and a request for either an emergency or major disaster declaration was submitted, it could be considered and if approved it could reimburse the state for eligible costs.”

If FEMA establishes a formula, state officials of all political stripes will likely come calling. Republican-led states seek disaster relief aid following hurricanes and other extreme weather events, even as their elected representatives publicly decry government spending on FEMA and climate action. There’s no reason to think heat will be any different. 

Chief heat, sustainability, and resilience officers could play a critical role in helping states figure out how to use this funding effectively. These officers are already puzzling out how to lessen the impacts of extreme heat on the public using the fewest dollars possible. They also know the heat is getting worse, that America is unprepared, and that someday, the public will demand answers. “We know that political winds change,” Segura said. When it comes to heat, it’s not a matter of if, she said, it’s a matter of when.

This post was updated with a comment from FEMA.






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