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All 27 NCFs analyzed for this report are expected to experience at least minimal disruption from climate change by 2100 under a scenario based on current greenhouse gas emissions

• By 2030, the NCFs at greatest risk are Provide Public Safety and Supply Water. These NCFs could face significant disruptions on the regional or local level due to climate change. Provide Public Safety governs already-strained responsibilities to protect against wildfire and hurricanes, and Supply Water faces risk of moderate disruption by 2030 due to flooding, wildfires, and long-term drought.
• Flooding, sea-level rise, and tropical cyclones and hurricanes pose the greatest risk of disruption to the NCFs. These three climate drivers were assessed as posing the greatest risk of national disruption to the NCFs. Nearly all 27 NCFs are anticipated to be at risk of moderate disruption or greater by 2100 from sea-level rise, three-quarters of the 27 from flooding, and more than two-thirds from tropical cyclones and hurricanes. Other drivers presenting risk to the NCFs are severe storm systems, extreme cold, extreme heat, wildfire, and drought.
• Because of the interconnected nature of U.S. infrastructure, risk to one NCF can cause cascading risk to others. Failure in the Distribute Electricity NCF has the highest potential for cascading risk in dependent NCFs, with more than 20 of the 27 NCFs requiring electricity to ensure normal operations. Disruption or failure of this NCF has potential for significant cascading and immediate effects on other NCFs, including those supporting food production, medical care, and water supply.

National Critical Functions (NCFs) are government and private-sector functions so vital that their disruption would debilitate security, the economy, public health, or safety. Researchers developed a risk management framework to assess and manage the risk that climate change poses to the NCFs and use the framework to assess 27 priority NCFs. This report details the risk assessment portions of the framework.

The team assessed risk based on a scale that the National Risk Management Center uses that ranges from a rating of 1 (no disruption or normal operations) to 5 (critical disruption on a national scale). A rating of 3 (moderate disruption) on the national level, although it still allows normal functioning on a national scale, should be regarded as highly significant and includes the potential for major disruptions or failure of NCFs at a local or regional level and for significant economic loss, health and safety impacts, and other consequences.

Using this risk rating scale and projected changes in eight climate drivers identified in the analysis (flooding, sea-level rise, tropical cyclones and hurricanes, severe storm systems, extreme cold, extreme heat, wildfire, and drought), the researchers examined how NCFs could be affected by and at risk from climate change in three future time periods (by 2030, by 2050, and by 2100) and two future greenhouse gas emission scenarios (current and high).

• Chapter One

  Introduction

• Chapter Two

  Methods

• Chapter Three

  Climate Drivers

• Chapter Four

  Synthesis of Results and High-Level Findings

• Chapter Five

  National Critical Function–Level Findings

• Chapter Six

  Cascading Risks

• Chapter Seven

  Conclusion

• Appendix

  National Critical Function Vulnerability Screening