Science Policy & Funding News

Seven Ways Climate Change Threatens U.S. Population's Health

A report by the U.S. Global Change Research Program finds health risks from global warming tied to heat, air quality, vector-borne diseases, water issues, extreme weather, nutrition, and mental stress.


Climate change imperils the health of every American, according to a report issued Monday by the White House.

“Current and future climate impacts expose more people in more places to public health threats,” states the scientific assessment by the U.S. Global Change Research Program. “Almost all of these threats are expected to worsen with continued climate change,” notes the report, developed by more than 100 experts from eight federal agencies. Some more vulnerable segments of the population, including people with low incomes, some communities of color and immigrant groups, pregnant women, young children, and the elderly, face the greatest impacts.

The report’s authors examined these climate change–related health risks for the past 3 years to update 2008 and 2014 U.S. government studies.

“It’s not just about polar bears and melting ice caps. It’s about our kids, it’s about our families, it’s about our future,” Environmental Protection Agency (EPA) administrator Gina McCarthy said at a 4 April White House event to release the report. EPA led the development of the report along with the National Oceanic and Atmospheric Administration and the Department of Health and Human Services.

McCarthy said she hopes the report can “jump-start the conversation about the dangers of inaction” and ignite a “call to action” in response to the public health risk.

Here are seven angles on the climate change health threat among many covered by the report:

  1. Temperature-Related Illnesses and Deaths With climate change increasing the frequency and severity of extreme heat events, heat-related premature deaths during summers will rise by thousands to tens of thousands. Uncertainty about how well people will adapt to extreme heat through air conditioning, acclimatization, and other factors limits how precisely researchers can predict the death toll. At Monday’s rollout of the report, White House science adviser John Holdren said the increased heat-related mortality “will be a really big deal in the hottest parts of the United States, as well as in the Middle East and South Asia and other places.” Projections indicate a corresponding but smaller decrease in cold-related premature deaths during winter.
  1. Air Quality Climate change will make meteorological conditions more conducive to the formation of ground-level ozone, a respiratory irritant. It will also roil weather patterns that affect the levels and locations of ozone and other air pollutants, making it harder for any particular regulatory scheme to reduce ozone. Rising temperatures, altered precipitation patterns, and increasing concentrations of atmospheric carbon dioxide likely will contribute to increases in some airborne allergen levels. That could lead to “longer and more intense allergy seasons,” Holdren said.
  1. Extreme Weather Projected increased frequency and severity of some extreme forms of weather likely will make coastal populations more vulnerable to health impacts from flooding and damage power, water, and communications systems and other infrastructure essential to public health and emergency response.
  1. Vector-Borne Diseases Climate change likely will expand the geographic range and time periods when vectors such as mosquitoes, ticks, and fleas can transmit illnesses, although better vector control and personal protection measures could help slow the rise of disease transmission rates.
  1. Water-Related Impacts Higher water temperatures could increase human exposure to water contaminants that cause illness, such as pathogens and toxic chemicals. More frequent extreme weather events and storm surges heighten the potential for key infrastructure for drinking water, wastewater, and storm water to fail because of damage or overcapacity.
  1. Food and Nutrition In addition to disrupting food production, prices, and trade in the United States and globally, climate change also likely will increase pathogens and toxins in food. Additionally, rising levels of carbon dioxide very likely will lower the nutritional value of food, including wheat and rice, by reducing plant species’ concentrations of protein and essential minerals.
  1. Mental Health Many people exposed to climate-related or weather-related disasters experience mental health consequences, according to the report. Those consequences include post-traumatic stress disorder, depression, and general anxiety.

—Randy Showstack, Staff Writer

Citation: Showstack, R. (2016), Seven ways climate change threatens U.S. population’s health, Eos, 97, doi:10.1029/2016EO049795. Published on 7 April 2016.

© 2016. The authors. CC BY-NC-ND 3.0
  • Judy Hopey

    is this thing about give us your money and the EPA?

    1. Yes, climate always changes.

    2. It’s not just about polar bears and melting ice caps.

    3. There is no doubt that during the last 2.58 Ma years our planet lived
    through a series of glacial events separated by interglacial periods.

    4. We are likely in an interglacial period. There is certainly no SIMPLE
    correlation between greenhouse gases and climate change (local and global).
    However, this does not mitigate the evidence that there is a cause and effect
    relationship; try the IPCC report.

    5. Do you wait for rock-solid evidence before you make any decision? When I
    have tried that, I have never acted on anything. I make the best choices with
    the information on hand at a given point in time.

    6. Who exactly is trying to scare us to of give our money? Gina McCarthy may
    want to keep her job, but I don’t see her asking me to give beyond paying my
    taxes. The EPA is funded by tax dollars, not donations.

    7. Try Peixoto, J. P. and A. H. Ooot, 1992: Physics of Climate. American
    Institute of Physics, Woodbury, NY, 520 pp. for an explanation of how it works.

    8. Adaptation is a significant part of dealing with climate change that is
    occurring at the present; in human history, a population has died off or

  • Hopkirk

    “It’s not about polar bears and melting ice caps. It’s” not about your kids, or your
    families, it’s about your money… Just give us your money and we will save you
    from a natural phenomenon that we have no power to stop. Hell, we do not even know how it works…

  • Hopkirk

    1. Climate always changes!; nature is not a static
    system, everything you see around you changes;
    2. During the last 2.58 Ma years our planet lived
    through a series of glacial events separated by interglacial periods;
    3. There is no rock-solid explanation as to why
    this is happening;
    4. The last glacial period (ice age) started about
    110,000 years ago and lasted till about 12,000 years ago;
    5. At the height of the last ice age, 3 to 4 km
    (1.9 to 2.5 mi) thick ice sheets covered about one third of the planet, which equates
    to a global sea level drop of about 120 m (390 ft);
    6. We are currently in the middle of the
    interglacial event, that is a period between the intermittent “ice ages”;
    7. Several times during its 4.5 billion year
    history Earth had much hotter climate than anything recorded during the minute
    existence of our species;
    8. It will get warmer before it will get cold
    9. We are not the cause of it and we cannot stop it
    and neither can the people who are trying to scare you out of your money no
    matter how much you give;
    10. We can only adapt.