Survivalist Pro
Survivalist Pro
Photo: Imad Clicks
NOAA's take: heat is the bigger killer Over the 30-year period 1988 – 2017, NOAA classified an average of 134 deaths per year as being heat-related, and just 30 per year as cold-related—a more than a factor of four difference.
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Read More »In a 2014 interview in the Washington Post of University of Miami climatologist Larry Kalkstein, who has published numerous research papers on weather-related mortality, weighed in on the matter: “Comparing apples to apples, which would be to evaluate acute or short-term responses to weather, I would always give the nod to heat-related deaths. However, if you are considering the seasonal differences in daily mortality, rather than just the “spikes” that we find with acute deaths, I can see why one can argue that winter (or cold-related) mortality is greater.” That was certainly the conclusion of a 2015 epidemiological study of deaths in 13 countries in The Lancet, which found that cold-related deaths in the U.S. were about a factor of fifteen higher than heat-related deaths. Cold deaths outnumbered heat deaths by a factor of twenty when averaged over all 13 countries studied. However, this study did not control for the seasonal cycle in death rates; deaths are always higher in winter, due to influenza and other non-weather-related factors. The 2005 study, Heat Mortality Versus Cold Mortality: A Study of Conflicting Databases in the United States, advocated using gross mortality (or excess mortality, as shown in Figure 2 for the 1995 Chicago heat wave) as a way to arrive at a better estimate of heat-and cold-related deaths. They stressed that one must correct for the seasonal cycle in deaths before using this technique, to remove the influence of the winter influenza season and other non-weather-related factors. Interestingly, they found that major heat waves cause big spikes in the death rate, whereas major cold waves do not: “Severe heat waves often produce large "spikes" in mortality, especially during the 1995 heat wave across the Midwest. However, abnormally cold conditions have little effect on the standardized daily mortality. For example, February 1996, a cold period across much of the United States, produced no spikes in winter mortality levels.” Similarly, from the 2016 U.S. National Climate Assessment: “The relationship between mortality and an additional day of extreme heat is generally much larger than the relationship between mortality and an additional day of extreme cold.” A 2011 study using such statistical techniques, An evaluation of the progress in reducing heat-related human mortality in major U.S. cities, found that heat killed approximately 1300 per year in 40 major U.S. cities between 1975–2004. This is an underestimate, since the full population of the nation was not included. Despite the fact that the climate has warmed in the U.S. in recent decades (by 1.3°F to 1.9°F since 1895, with much of that increase occurring since 1970), the study found that the death rate due to heat has been decreasing, due to adaptation. Figure 3. The increased U.S. annual economic damages from climate change in 2090, assuming a business-as-usual approach (a scenario called RCP8.5). Sectors with estimated damages larger than $5 billion per year are labeled, and include the percent decrease in damages if moderately aggressive efforts to control greenhouse emissions are adopted (a scenario called RCP4.5). Sectors with less than $5 billion annual damages in 2090 under RCP8.5 are noted with asterisks, with no damage estimates given. Increased damages due to higher extreme heat mortality ($140 billion per year) are predicted to be second only to the $160 billion in annual damages due to lost wages due to a 1.9 billion lost labor hours, especially for outdoor industries whose workers are exposed to the elements. Image credit: EPA, 2017, “Multi-Model Framework for Quantitative Sectoral Impacts Analysis: A Technical Report for the Fourth National Climate Assessment”. Extreme temperature deaths may increase by 9300 per year by 2090 at a cost of $140 billion per year
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Read More »The Fourth National Climate Assessment, released in 2018 on the day after Thanksgiving by the Trump Administration, found that under a business-as-usual approach to climate change (a scenario called RCP8.5, the path we are currently on), we should expect a large increase in U.S. extreme temperature deaths. In 49 large U.S. cities representing one-third of the nation’s population, the study projected that changes in extreme hot and extreme cold temperatures would result in 9300 additional premature deaths per year by 2090, at a cost of $140 billion per year (in 2015 dollars). Since the study only covered one-third of the nation’s population, these are likely underestimates. The study did take into account the reduction in extreme cold deaths expected in a warmer climate; approximately 100 fewer cold deaths per year were expected by 2050, with no further reduction in cold deaths between 2050 and 2090. As discussed in the 2015 study in The Lancet, the great majority of cold-related deaths occur in moderately cold conditions, so a reduction in extreme cold due to global warming is not expected to cause a large reduction in cold-related deaths. The number of future extreme temperature deaths is likely to be lower than these estimates, though, when considering acclimatization or other adaptations (for example, increased use of air conditioning). The study estimated that extreme temperature deaths might be reduced by more than a factor of two, from 9300 per year to 4300 per year, from acclimatization or other adaptation efforts. However, the toll would be higher when considering the synergistic effect between extreme heat and increased ozone air pollution that is likely in a hotter climate. If moderately aggressive efforts to control greenhouse emissions are adopted (a scenario called RCP4.5), more than half of projected deaths could be avoided each year, down to 3900, at a savings of $80 billion per year. Related post: Flu Weather: It's Not the Cold, It's the Humidity by Bob Henson, Feb. 2018.
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