Future for warming US: Not just the heat but the humanity

Future for warming US: Not just the heat but the humanity
In this July 6, 2010 fik photo, a construction worker is backlit from the morning sun while working on a roof in the heat in Chapel Hill, N.C. as temperatures inched into at least the 90s from Maine to Texas and into the Southwest and Death Valley, the mid-Atlantic is embarking on a string of intensely hot days, with temperatures in some places closing in on 100-plus degrees. The combination of global warming and people moving south and west means that by mid-century four to six times more Americans will be sweating through days with extreme heat than just 15 years ago, a new study says. (AP Photo/Gerry Broome, File)

The combination of global warming and shifting population means that by mid-century, there will be a huge increase in the number of Americans sweating through days that are extremely hot, a new study says.

People are migrating into areas—especially in the South—where the heat is likely to increase more, said the authors of a study published Monday by the journal Nature Climate Change. The study highlighted the Houston-Dallas-San Antonio and Atlanta-Charlotte-Raleigh corridors as the places where the double whammy looks to be the biggest.

"It's not just the that is changing in the future," said study co-author Linda Mearns, a senior scientist at the National Center for Atmospheric Research in Boulder, Colorado. "It is many things: how many people and where people are that affects their exposure to climate changes."

In a unique study looking at the interplay of projected changes in climate and population, scientists tried to characterize the number of people who will feel temperatures of 95 degrees or higher and how often they will feel it. They used a figure called person days for the extreme heat to reflect both the length of time heat waves continued and how many people felt it by multiplying people affected by how many days they felt the heat.

Between 1970 and 2000, the U.S. averaged about 2.3 billion person days of each year. But between 2040 and 2070 that number will be between 10 and 14 billion person days a year, according to the study.

The biggest projected increases in person days is the Texas, Oklahoma, Louisiana, Arkansas census region where by mid-century heat exposure will increase by 2.7 billion person days. Right behind is south Atlantic region of Florida, Georgia, South Carolina, North Carolina, Virginia, West Virginia, Maryland, Delaware and Washington, D.C., where heat exposure is projected to increase by 2.2 billion person days. New England gets off the easiest with an increase of only 71 million person days.

The scientists used 11 different climate models based on current trends of heat-trapping carbon dioxide emissions and matched those with demographic trends. Both the increased heat and population shifts had about equal effects but together they made matters even worse, said lead author Bryan Jones, a population geographer at the City University of New York.

Exposure of US population to extreme heat could quadruple by mid-century
Expected increase in average annual person-days of exposure to extreme heat for each US Census Division when comparing the period 1971-2000 to the period 2041-2070. Person-days are calculated by multiplying the number of days when the temperature is expected to hit at least 95 degrees by the number of people who are projected to live in the areas where extreme heat is occurring. The scale is in billions. Credit: ©UCAR.

The question is, will be people adapt by changing their lifestyle, such as staying indoors and using more air conditioning, or will they move to cooler climates. Jones said it is unlikely that people will move to cooler areas to escape the , saying historically people tend to move away from colder areas and into warmer areas like Florida, Arizona and North Carolina.

The scientists chose a threshold of 95 degrees because "at 95 people really, really start feeling it," Mearns said. "Even in a dry climate and I'm sitting here in Boulder, Colorado."

Several outside scientists praised the study. University of Georgia meteorology professor Marshall Shepherd said the problem is likely even worse when you take into consideration the fact that cities get hotter than rural areas.

Explore further

Study blames global warming for 75 percent of very hot days

More information: Future population exposure to US heat extremes, DOI: 10.1038/nclimate2631
Journal information: Nature Climate Change

© 2015 The Associated Press. All rights reserved.

Citation: Future for warming US: Not just the heat but the humanity (2015, May 18) retrieved 16 January 2021 from https://phys.org/news/2015-05-future-humanity.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Feedback to editors

User comments