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Add surgeries to the list of human activities making the climate hotter and more volatile.

"Surgical, obstetric, and anaesthesia care is one of the major contributors to climate change within the health sector," according to an article published this month in 

 scientific journal by doctors and researchers from the Harvard T.H. Chan School of Public Health. They worry that the climate impact of current surgical practices will get worse as lifesaving procedures become accessible to the 

, mostly in low- and middle-income countries, who currently can't get them.

"We do need to get more people surgical care," says Dr. 

, co-author of the article and interim director of the Center for Climate Health and the Global Environment at Harvard University. "But if we do it in a model that has been developed in rich countries, it will break the climate — and we can't afford that."

Globally, health care is responsible for about 4.6 percent of greenhouse gas emissions, according to a

 in The Lancet. A quarter of that is from the U.S., despite it having 4 percent of the global population.

"If the health sector globally were a country, it would be the fifth [largest] emitter of greenhouse gases," says 

, international sustainability director at Health Care Without Harm, an organization working to reduce the environmental footprint of health care globally.

The article zeroes in on surgical care because it's the most energy- and waste-intensive specialty in health care. Operating rooms can consume three to six times more energy per square foot than elsewhere in a hospital, according to

. That's because heating, ventilation and air conditioning in operating rooms run on high even when no patients are in them. The article says that if hospitals ventilated operating rooms only when they were occupied, this would significantly reduce energy consumption.

Operating rooms also produce 20 percent to 30 percent of a facility's waste, by

, which must be disposed of through incineration.

The use of certain anesthetic gases, such as nitrous oxide and desflurane, is another major source of greenhouse gases in operating rooms, according to the article. Anesthetics that are injected instead of inhaled, on the other hand, leave a minimal carbon footprint.

"The easiest thing we can do is stop wasting so much," says Dr. 

, associate professor of anesthesiology and of epidemiology in environmental health sciences at Yale University. "We waste a tremendous amount."

Besides wasting energy, Sherman says, there are many other inefficiencies in the health care system contributing to climate change. For example, nearly $3 billion in chemotherapy drugs were being thrown out in the U.S. annually because the single-use vials held more drug than was required, according to a 2016 

Additionally, too many tools and devices are unwrapped in operating rooms to have them available in case they're needed, says Bernstein, who is also a pediatrician at Boston Children's Hospital. The packaging is discarded, as are any disposable tools, even if they aren't used, because they're no longer sterile.

"The more stuff we use, the more stuff is manufactured," Sherman says. "The more stuff is manufactured, the more energy we're using and the more stuff we have to treat

 with Practice Greenhealth, an organization that helps the health care industry adopt environmentally sustainable solutions, says she has experienced plenty of pushback against sustainability initiatives from surgeons and other members of the sector.

"There is still the perception that green products are more costly, when that's not always the case," Sheehan says. Additionally, some critics think sustainability practices take too much time or aren't as safe, she says. Others aren't interested in changing habits that have worked so far.

But the Lancet article warns that climate change is already having a negative effect on doctors' ability to serve their patients. Not only are diseases changing and worsening because of increasing temperatures and pollution, but climate disasters, such as heat waves, storms and fires, are also destroying hospitals, cutting off power and interrupting supply chains.

Bernstein says it's "absolutely" possible to increase access to surgical care without "breaking the climate," despite challenges. For example, biomedical devices should be labeled with their energy-efficiency ratings, like refrigerators and TVs are, Wilburn suggests.

Developing countries could also skip the wasteful, carbon-intensive practices prevalent in wealthier nations and go straight to sustainable options. 

, for example, is designed so that natural wind flows ventilate surgical suites, eliminating the need to burn fossil fuels to mechanically ventilate them. In Haiti,

 is solar powered, which has allowed the hospital to operate at lower cost, without power interruptions. Power outages in the city of

Mirebalais average three hours per day and are worse during disasters such as hurricanes.

 found that cataract surgery methods in southern India — using manual, reusable tools — were cheaper and faster, produced fewer emissions and had a low infection rate compared with how the surgery is usually done in the West with an ultrasonic machine.

"These are real windows into the future of sustainable health care in surgical practice," Bernstein says.

And it's something that wealthier countries can learn from.

"Sometimes wealthy countries tend to think that our approach is best," Sheehan says, "when oftentimes, there is something to be learned from countries that are working with [fewer] resources."

Joanne Lu is a freelance journalist who covers global poverty and inequity. Her work has appeared in Humanosphere, 

, Global Washington and War Is Boring. Follow her on Twitter: 

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Joanne Lu

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With surgical care on the rise globally, researchers worry the energy-consuming procedures will have a negative impact on the climate. But they say there are ways to make them more energy efficient.

Surgical care is not great for the environment. Can it be more sustainable?

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