Summer has officially begun with a blast of scorching temperatures across much of the United States. The National Weather Service is warning of “extremely dangerous heat” baking 160 million people under a heat dome stretching from the Midwest to the East Coast the rest of this week. It’s already proven fatal.
But while this is the first real taste of extreme heat for Northeastern cities, parts of the country like Texas have been cooking since May. Alaska this month issued its first-ever heat advisory. Forecasters expect more above-average temperatures through the summer.
Summers are indeed getting hotter, a consequence of the warming planet. As the climate heats up, the frequency and intensity of heat waves is increasing and their timing is changing, arriving earlier in the season.
But the damage from extreme heat isn’t spread out evenly, and the more dangerous effects to people are not necessarily found in the hottest places. High temperatures often lead to more emergencies and hospital visits when they represent a big jump from a place’s average, which means ordinarily cooler regions tend to suffer the worst harm from heat. That includes places like Alaska and the Pacific Northwest, where temperatures rarely climb higher than 80 degrees Fahrenheit and most homes don’t have air conditioning.
Now researchers have found that rural areas may suffer more under extreme heat than previously thought. A report from Headwaters Economics and the Federation of American Scientists found that more than half of rural zip codes in the United States, which includes some 11.5 million Americans, have “high” heat vulnerability, a consequence not just of temperatures but unique risk factors that occur far outside of major cities.
The thermometers thus do not tell the whole story about who is likely to suffer from extreme heat — nor do the images, which tend to come from sweltering cities. But understanding the factors that worsen the harm of rising temperatures could help save lives.
One factor: the median age of the rural population is older than in cities. That matters, because on a physiological level, older adults struggle more to cope with heat than the young. People living in rural communities also have double the rates of chronic health conditions that enhance the damage from heat like high blood pressure and emphysema compared to people living in urban zip codes.
Rural infrastructure is another vulnerability. While there may be more forests and farms in the country that can cool the air, the buildings there are often older, with less adequate insulation and cooling systems for this new era of severe heat. Manufactured and mobile homes, more common in rural areas, are particularly sensitive to heat. In Arizona’s Maricopa County, home to Phoenix, mobile homes make up 5 percent of the housing stock but account for 30 percent of indoor heat deaths.
Even if rural residents have air conditioners and fans, they tend to have lower incomes and thus devote a higher share of their spending for electricity, up to 40 percent more than city dwellers, which makes it less affordable for them to stay cool. That’s if they can get electricity at all: Rural areas are more vulnerable to outages due to older infrastructure and the long distances that power lines have to be routed, creating greater chances of problems like tree branches falling on lines.
Sparsely populated communities also have fewer public spaces, such as shopping malls and libraries, where people can pass a hot summer day. Rural economies also depend more on outdoor labor, and there are still no federal workplace heat regulations. Farmworkers, construction crews, and delivery drivers are especially vulnerable to hot weather, and an average of 40 workers die each year from extreme heat.
The health infrastructure is lacking as well. “There is a longstanding healthcare crisis in rural areas,” said Grace Wickerson, senior manager for climate and health at the Federation of American Scientists. There aren’t always nearby clinics and hospitals that can quickly treat heat emergencies. “To really take care of someone when they're actually in full-on heat stroke, they need to be cooled down in a matter of minutes,” Wickerson said.
Looking at data from the Centers for Disease Control and Prevention and the US Census Bureau, Wickerson and her collaborators mapped out how all these underlying factors are converging with extreme heat. They found that 59 percent of urban zip codes and 54 percent of rural zip codes are highly vulnerable to extreme heat as defined by the CDC’s Heat and Health Index, meaning they are much more likely to see health problems from extreme heat. So while rural areas may be cooler, the people living there face heat dangers comparable to those in much hotter cities, and geographically, they cover a much wider expanse of the country.
So while temperatures out in the sticks may not climb to the same peaks they do in downtowns, urban heat islands are surrounded by an ocean of rural heat vulnerabilities.
For more, you can read Umair's full story here.
