A new study from Cornell University casts new on thee life-threatening reality climate change:
Severe Caribbean droughts may magnify food insecurity
A comparison of drought conditions between 2015 and 2017 on the island of Hispaniola, home to Haiti (in the west) and the Dominican Republic. Using the Palmer Drought Severity Index, dark brown indicates severe to extreme drought, while blue colors indicate wetter than normal conditions. In the summer of 2015, when the Pan-Caribbean drought peaked, most of Hispaniola had severe drought conditions. In contrast, the western portion of the island – mostly Haiti – had wetter-than-normal conditions in January 2017 due to rain from Hurricane Matthew in October 2016. Even after the hurricane, drought conditions remained for the Dominican Republic.
More from Cornell:
Climate change is impacting the Caribbean, with millions facing increasing food insecurity and decreasing freshwater availability as droughts become more likely across the region, according to new Cornell research in Geophysical Research Letters [open access].
“Climate change – where mean temperatures rise – has already affected drought risk in the Caribbean. While our research focused on the role of human-causes for the strong 2013-16 drought there, our findings and climate-model projections show that drought in the region will likely to become more severe over time,” said lead author Dimitris Herrera, postdoctoral associate in earth and atmospheric sciences.
Since 1950, the Caribbean region has seen a drying trend and scattered multiyear droughts. But the recent Pan-Caribbean drought in 2013-16 was unusually severe and placed 2 million people in danger of food insecurity.
In Haiti, for example, over half the crops were lost in 2015 due to drought, which pushed about 1 million people into food insecurity, while an additional 1 million people suffered food shortages throughout the region, according to the United Nations Office for the Coordination of Human Affairs.
Examining climatological data from the 2013-16 Pan-Caribbean drought, anthropogenic warming accounted for a 15 to 17 percent boost of the drought’s severity, Herrera said.
Climate model simulations indicate the most significant decrease in precipitation in the Caribbean might occur May through August – the rainy season. A failed rainy season in spring and summer, added to a normal dry season in the late fall and winter, prolongs a drought.
Beyond growing crops, the Caribbean also faces dwindling freshwater resources, due to saltwater intrusion from rising seas and pressure from agricultural and municipal sectors.
“This paper documents that human activity is already affecting the drought statistics of the region,” said Toby Ault, assistant professor of earth and atmospheric sciences, and a fellow at Cornell’s Atkinson Center for a Sustainable Future. “Hot temperatures in the future will probably continue to play an increasingly important role in exacerbating droughts.”
Although the Caribbean has recently been affected by catastrophic hurricanes – such as Maria and Irma – that caused significant and rapid damage, persistent droughts can slowly bring havoc to vulnerable Caribbean countries, said Herrera: “This is especially true for the agriculture and tourism sectors of this region, which are the most important contributors to gross domestic product in most Caribbean nations.”
Other authors are of “Exacerbation of the 2013-2016 Pan Caribbean Drought by Anthropogenic Warming,” are John Fasullo, National Center for Atmospheric Research; Sloan Coats, Woods Hole Oceanographic Institution; Carlos Carrillo, Cornell; Benjamin Cook, NASA Goddard Institute for Space Studies; and A. Park Williams, Lamont Doherty Earth Observatory, Columbia University.
The research was supported by the National Center for Atmospheric Research, the National Science Foundation and NASA.
But there’s some potentially good news, too
Another new study, this one from the University of Pittsburgh Medical Center, study links over-consumption of alcohol with two curious factors, cold temperatures and alcohol.
While climate change won’t tilt the Earth’s axis further south, it’s already making northern latitudes warmer, so there’ll be less need for somatic antifreeze. . .
We begin with a map from the study comparing levels of booze-guzzling and binge behavior in the counties of the good ol’ U.S of .A. [click on it to embiggen]:
From the University:
Where you live could influence how much you drink. According to new research from the University of Pittsburgh Division of Gastroenterology, people living in colder regions with less sunlight drink more alcohol than their warm-weather counterparts.
The study, recently published online in Hepatology, [$6 for 48-hour access] found that as temperature and sunlight hours dropped, alcohol consumption increased. Climate factors also were tied to binge drinking and the prevalence of alcoholic liver disease, one of the main causes of mortality in patients with prolonged excessive alcohol use.
“It’s something that everyone has assumed for decades, but no one has scientifically demonstrated it. Why do people in Russia drink so much? Why in Wisconsin? Everybody assumes that’s because it’s cold,” said senior author Ramon Bataller, M.D., Ph.D., chief of hepatology at UPMC, professor of medicine at Pitt, and associate director of the Pittsburgh Liver Research Center. “But we couldn’t find a single paper linking climate to alcohol intake or alcoholic cirrhosis. This is the first study that systematically demonstrates that worldwide and in America, in colder areas and areas with less sun, you have more drinking and more alcoholic cirrhosis.”
Alcohol is a vasodilator – it increases the flow of warm blood to the skin, which is full of temperature sensors – so drinking can increase feelings of warmth. In Siberia that could be pleasant, but not so much in the Sahara.
Drinking also is linked to depression, which tends to be worse when sunlight is scarce and there’s a chill in the air.
Using data from the World Health Organization, the World Meteorological Organization and other large, public data sets, Bataller’s group found a clear negative correlation between climate factors – average temperature and sunlight hours – and alcohol consumption, measured as total alcohol intake per capita, percent of the population that drinks alcohol, and the incidence of binge drinking.
The researchers also found evidence that climate contributed to a higher burden of alcoholic liver disease. These trends were true both when comparing across countries around the world and also when comparing across counties within the United States.
“It’s important to highlight the many confounding factors,” said lead author Meritxell Ventura-Cots, Ph.D., a postdoctoral researcher at the Pittsburgh Liver Research Center. “We tried to control for as many as we could. For instance, we tried to control for religion and how that influences alcohol habits.”
With much of the desert-dwelling Arab world abstaining from alcohol, it was critical to verify that the results would hold up even when excluding these Muslim-majority countries. Likewise, within the U.S., Utah has regulations that limit alcohol intake, which have to be taken into account.
When looking for patterns of cirrhosis, the researchers had to control for health factors that might exacerbate the effects of alcohol on the liver—like viral hepatitis, obesity and smoking.
In addition to settling an age-old debate, this research suggests that policy initiatives aimed at reducing the burden of alcoholism and alcoholic liver disease should target geographic areas where alcohol is more likely to be problematic.
Additional authors on this study include Ariel Watts, B.S., Neil Shah, M.D., Peter McCann, M.D., and A. Sidney Barritt IV, M.D., all of the University of North Carolina at Chapel Hill; Monica Cruz-Lemini, M.D., Ph.D., of the Universidad Nacional Autónoma de México at Juriquilla; Jose Altamirano, M.D., of Hospital Quirónsalud in Barcelona; Juan Abraldes, M.D., from The University of Alberta; Nambi Ndugga, M.P.H., of Harvard; and Anant Jain, M.D., Samhita Ravi, and Carlos Fernández-Carrillo, M.D., Ph.D., all of Pitt.
This research was supported by National Institute on Alcohol Abuse and Alcoholism awards U01AA021908 and U01AA020821, the Mexican National Council for Science and Technology and the Spanish Association for the Study of the Liver.