Global Climate Change in Your Community: Take Action Now

Jan 07, 2019 | nacchovoice

By Grace McClain, Program Analyst, NACCHO

This story originally ran in NACCHO’s Essential Elements blog.

Global climate change may seem like a public health threat of the future, but many communities in the United States are feeling the health impacts of climate change today. Both geological and medical sciences have linked climate change to extreme weather events like hurricanes and wildfires, hotter temperatures, and a wider distribution of vector-borne diseases. Public health professionals need to brace themselves for a continued and escalating response on these fronts.

Representatives from local health departments frequently work with NACCHO to provide firsthand perspectives into advocacy and programmatic needs. Kari Sasportas works for the Cambridge Public Health Department and serves as a member of the NACCHO Global Climate Change Advisory Workgroup:

“One of the barriers we’ve encountered is that there are more pressing concerns than future climate risk for residents who are simply struggling to get by on a day-to-day basis. We determined that an optimal way to reach people who simply do not have the luxury of thinking too far ahead would be to reframe the city’s work on climate adaptation with an equity lens and to bring the voices of the most highly impacted residents to the forefront of the conversation.”

Recent Climate Change Reports

Climate science often presents best-case and worst-case scenarios for regional temperature and climactic effects. Public health then applies these analyses to evaluate the current and predicted impacts of climate change on local public health.

Climate change and health experts from the Intergovernmental Panel on Climate Change (IPCC), the World Health Organization (WHO), the U.S. Global Climate Change Research Program, and the Lancet Countdown all released publications in the last six months describing the ways vulnerable populations will be affected by climate change.

Two of these publications describe how climate change will impact local jurisdictions in the United States:

Fourth National Climate Assessment

The National Climate Assessment is a congressionally-mandated report from the U.S. Global Change Research Program released at least every four years. The Fourth National Climate Assessment, released on November 23, 2018 contains several key messages related to climate and health:

  • Climate change affects the health of all Americans.
  • Exposure and resilience vary across populations and communities.
  • Adaptation reduces risk and improves health.
  • Reducing greenhouse gas emissions results in health and economic benefits.

Read the full report here.

Lancet Countdown: Tracking Progress on Health and Climate Change

The Lancet Countdown, a branch of the UK-based medical journal, recently released an annual update framed as a “checkup” for environmental public health that includes country-specific briefs. The U.S. Country brief includes the following key messages:

  1. The human symptoms of climate change are unequivocal and potentially irreversible – affecting the health of populations around the world, today.
  2. The delayed response to climate change over the past 25 years has jeopardized human life and livelihoods.
  3. The transition to low-carbon electricity generation is gathering pace, suggesting the beginning of a broader transformation that will benefit human health.

Create a free account to read the Lancet Countdown 2018 Report.

Click here to view the U.S.-specific country brief.

Health Impact Stories from the Field

Extreme Weather Events

The 2017 hurricane season, which saw the arrival of Hurricanes Harvey, Maria, and Irma, sparked conversation among health and climate professionals about whether the severity and frequency of these storms would become the new norm, brought about by increasing global temperatures.

“Public health agencies and local health departments are revising their preparedness toolkits to prepare their constituencies for tornadoes, flooding, heat waves and extreme snowstorms” says Charles R. Stack, a doctoral candidate at the University of Illinois, Chicago School of Public Health.

Hurricane Harvey unleashed 33 trillion gallons of water on Houston. Under the leadership of Harris County Public Health Executive Director Dr. Umair Shah (who was also serving as NACCHO president at the time), the health department and other city agencies mounted a massive response involving community outreach for vital services; activation of memos of understanding to obtain supplies; and mitigation of environmental health threats like mold, mosquitoes, and floodwaters contaminated with toxicants.

These storms and their impacts will continue to loom over coastal communities. The experiences of Puerto Rico and Florida in 2017 and South Carolina in 2018 are additional reminders that local health departments must work collaboratively with other planning and preparedness agencies to protect populations, especially the most vulnerable.

Heat-related Illness

Across the country, health officials are asking what they can do to prepare communities for abnormally hot summers. Heat can be a particularly difficult environmental health threat because vulnerability varies across and within populations—children, the poor, and the elderly are all populations of concern. Additionally, cities with lower average temperatures are likely to have lower thresholds for heat alerts and emergencies due to residents’ level of acclimatization.

The NACCHO Climate Change Workgroup is actively working to compile examples of heat response standards across diverse local health departments. Look out for an announcement about a spring 2019 webinar to present these findings.

Vector-borne Disease

Global climate change will improve habitats for vectors like mosquitoes and ticks that spread disease, so vectors previously only found in more tropical climates will spread geographically. These ecological changes can also support the emergence of novel pathogens like chikungunya, dengue virus, Zika virus, Heartland virus, and ehrlichiosis. The Centers for Disease Control and Prevention (CDC) reports that cases of vector-borne disease have approximately tripled in the last decade.

Following the Zika epidemic in 2015 – 2016, NACCHO conducted a survey evaluating local capacity to conduct surveillance of mosquito-borne illnesses. The results showed that more than 80% of local vector control organizations, many of which are housed in branches of local government other than public health, do not have full capabilities to monitor and respond to mosquito-borne illnesses.

Act Now

Each one of the key messages presented by the Fourth National Climate Assessment and the Lancet Countdown are a call to action for local health departments. Earlier this year, NACCHO revised a guidance document to assist health departments in their response to the health effects of a changing global climate. These Essential Actions for Climate Resilience in Local Health Departments outline ways that local health officials can participate in climate change mitigation and adaptation:


  • Educate yourself and your health department staff about how the results of these reports will affect your community firsthand
  • If you are unable to read the full reports, look at related fact sheets.

Participate and Discuss:

  • Examine the health effects listed above through the lens of climate change.
  • Develop a public outreach campaign with one or more of these recent reports as the focal point.
  • Identify local organizations working in climate and health, and ask how you can help each other.
  • Share this blog post with interested parties.


  • Work with other branches of local government to identify common goals in mitigating and adapting to climate change.
  • Speak with community members about health impacts of climate change that they are experiencing firsthand; conversations spark ideas about measurement and support.


  • Develop and implement a plan to address climate change in your community. This can take the form of a vulnerability assessment or a needs assessment.
  • The CDC Building Resilience Against Climate Effects (BRACE) Framework is the gold standard in local public health programs, policies, and evaluation for climate and health. Other best-practice guidelines include implementing Health in All Policies or using an assessment like NACCHO’s Protocol for Assessing Community Excellence in Environmental Health (PACE EH).


  • Use metrics from APHA, the Lancet Countdown, and other reports as a foundation to begin describing your local relationship between climate change and human health.
  • Continuously work to reevaluate measures, indicators, and performance.
  • Think creatively and strategically!

Visit the NACCHO Climate Change webpage for more information and resources on climate and health. For questions regarding this post, please contact Grace McClain, MPH, REHS or Chelsea Gridley-Smith, PhD.

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