Fishers & Farmers In Brazil, India May Face 100 Days Or More Every Year When Wet-Bulb Temps Hit Safety Limits By 2050
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India, in particular, is projected to be one of the countries whose workforce will be most exposed to heat stress under the business-as-usual climate scenario. There are roughly 260 million agricultural workers in India. By 2050, 94 percent of the country’s population could face more than 100 days in a year when at least one daytime working hour exceeds a wet-bulb temperature of 28 degrees Celsius, or 82.4 degrees Fahrenheit — a conservative threshold of what is considered safe for acclimatized workers experiencing moderate rates of work. (Unacclimatized workers, or those unaccustomed to working in such environments, will face greater levels of heat risk at the same temperature and amount of work.)
In Brazil, another of the world’s top agricultural suppliers, heat risk is not as dire, but still poses a substantial risk for outdoor workers, including Pinto da Costa’s community of fisherfolk. By 2050, roughly 41 percent of the country’s population could experience more than 100 days a year when wet-bulb temperatures exceed the recommended threshold for at least one hour a day, according to the Boulder team’s analysis.
Mary Jo Dudley, the director of Cornell University’s Farmworker Program and the chair of the U.S. National Advisory Council of Migrant Health, said that the analysis is significant for what it reveals about the human health consequences of extreme heat, particularly as it relates to the world’s agricultural laborers. She’s seeing more and more outdoor agricultural workers in the U.S. adopt overnight schedules, which is only adding to the burdens and inequities the wider workforce already suffers from. This is poised to get worse. Zulueta and Mehrabi found that 35 percent of the total U.S. population will experience more than 100 days of wet-bulb temperatures exceeding 28 degrees C, or 82.4 degrees F, for at least one hour a day every year by 2050.
“This transition to a nighttime schedule pushes an extremely vulnerable population into more difficult work conditions that have significant mental and physical health impacts,” said Dudley. Rebuking the human body’s circadian rhythms — that 24-hour internal clock that regulates when you sleep and wake — ramps up a person’s risk of health complications, such as cardiovascular disease and types of cancer, and diminishes their body’s ability to handle injury and stress. Working untraditional hours also can reduce a person’s ability to socialize or participate in cultural, communal activities, which are associated with positive impacts on brain and body health.
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https://grist.org/food-and-agriculture/overnight-work-extreme-heat-adaptation-agriculture/