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US Fifth National Climate Assessment

Energy for One World
Energy for One World

The document summarizes key points from Chapter 1 of the Fifth National Climate Assessment: 1) Climate change is already causing widespread impacts across the United States that are worsening, while efforts to reduce emissions and adapt have expanded since 2018. 2) Severe climate risks will continue to grow without deeper cuts to global emissions and increased adaptation efforts. 3) Large reductions in emissions are possible with existing technologies, but achieving net-zero by 2050 requires additional options and equitable, just approaches to mitigation and adaptation.

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1 FIFTH NATIONAL CLIMATE ASSESSMENT Chapter 1 | Overview
2 Chapter 15 | Fifth National Climate Assessment | nca2023.globalchange.gov Chapter QR code Information for presenters NCA5 Website: https://nca2023.globalchange.gov Chapter Website: https://nca2023.globalchange.gov/chapter/1 NCA5 Atlas: https://atlas.globalchange.gov Figure captions can be found in the slide notes of this deck Social media: @usgcrp, #NCA5
3 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov How the United States Is Addressing Climate Change The effects of human-caused climate change are already far-reaching and worsening across every region of the United States. Rapidly reducing greenhouse gas emissions can limit future warming and associated increases in many risks. Across the country, efforts to adapt to climate change and reduce emissions have expanded since 2018, and US emissions have fallen since peaking in 2007. However, without deeper cuts in global net greenhouse gas emissions and accelerated adaptation efforts, severe climate risks to the United States will continue to grow.
4 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov How the United States Is Experiencing Climate Change As extreme events and other climate hazards intensify, harmful impacts on people across the United States are increasing. Climate impactscombined with other stressorsare leading to ripple effects across sectors and regions that multiply harms, with disproportionate effects on underserved and overburdened communities.
5 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Current and Future Climate Risks to the United States Climate changes are making it harder to maintain safe homes and healthy families; reliable public services; a sustainable economy; thriving ecosystems, cultures, and traditions; and strong communities. Many of the extreme events and harmful impacts that people are already experiencing will worsen as warming increases and new risks emerge.
6 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov The Choices That Will Determine the Future With each additional increment of warming, the consequences of climate change increase. The faster and further the world cuts greenhouse gas emissions, the more future warming will be avoided, increasing the chances of limiting or avoiding harmful impacts to current and future generations.
7 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov How Climate Action Can Create a More Resilient and Just Nation Large near-term cuts in greenhouse gas emissions are achievable through many currently available and cost-effective mitigation options. However, reaching net-zero emissions by midcentury cannot be achieved without exploring additional mitigation options. Even if the world decarbonizes rapidly, the Nation will continue to face climate impacts and risks. Adequately and equitably addressing these risks involves longer-term inclusive planning, investments in transformative adaptation, and mitigation approaches that consider equity and justice.
8 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.1. Climate change presents risks while action to limit warming and reduce risks presents opportunities for the US.
9 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.2. Increasing capacities and decreasing costs of low-carbon energy technologies are supporting efforts to further reduce emissions.
10 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.3. Cities and states are acting on climate change, with a substantial increase in new activities underway since 2018.
11 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.4. Different scenarios of future carbon dioxide emissions are used to explore the range of possible climate futures.
12 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.5. The US has warmed rapidly since the 1970s.
13 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.6. Current climate conditions are unprecedented for thousands of years.
14 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.7. The US now experiences, on average, a billion-dollar weather or climate disaster every three weeks.
15 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.8. Lower-income urban neighborhoods experience higher surface temperatures.
16 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.9. Losses due to floods are projected to increase disproportionately in US Census tracts with higher percentages of Black residents.
17 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.10. Increasing flooding puts more people and assets at risk.
18 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov
19 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.12. Employment gains in electrification and renewable energy industries are projected to far outpace job losses in fossil fuel industries.
20 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.13. When or if the US reaches a particular level of warming depends on global greenhouse gas emissions from human activities.
21 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.14. What would 3.6属F (2属C) of global warming feel like in the United States?
22 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.15. At higher global warming levels, the US will experience more severe climate impacts.
23 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.16. Reaching net zero by 2050 in the US will involve a mix of reductions in greenhouse gas emissions and increases in carbon dioxide removal.
24 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Chapter Team Federal Coordinating Lead Author Allison R. Crimmins, US Global Change Research Program Chapter Lead Alexa K. Jay, US Global Change Research Program / ICF Chapter Authors Christopher W. Avery, US Global Change Research Program / ICF Travis A. Dahl, US Army Corps of Engineers Rebecca S. Dodder, US Environmental Protection Agency Benjamin D. Hamlington, NASA Jet Propulsion Laboratory Allyza Lustig, US Global Change Research Program / ICF Kate Marvel, Project Drawdown Pablo A. M辿ndez-Lazaro, University of Puerto Rico Mark S. Osler, National Oceanic and Atmospheric Administration Adam Terando, US Geological Survey Emily S. Weeks, US Agency for International Development Ariela Zycherman, NOAA Climate Program Office
25 Recommended chapter citation Read the full chapter nca2023.globalchange.gov @usgcrp usgcrp GlobalChange.gov Connect with USGCRP: Jay, A.K., A.R. Crimmins, C.W. Avery, T.A. Dahl, R.S. Dodder, B.D. Hamlington, A. Lustig, K. Marvel, P.A. M辿ndez-Lazaro, M.S. Osler, A. Terando, E.S. Weeks, and A. Zycherman, 2023: Ch. 1. Overview: Understanding risks, impacts, and responses. In: Fifth National Climate Assessment. Crimmins, A.R., C.W. Avery, D.R. Easterling, K.E. Kunkel, B.C. Stewart, and T.K. Maycock, Eds. U.S. Global Change Research Program, Washington, DC, USA. https://doi.org/10.7930/NCA5.2023.CH1 https://nca2023.globalchange.gov/chapter/1

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US Fifth National Climate Assessment

  • 1. 1 FIFTH NATIONAL CLIMATE ASSESSMENT Chapter 1 | Overview
  • 2. 2 Chapter 15 | Fifth National Climate Assessment | nca2023.globalchange.gov Chapter QR code Information for presenters NCA5 Website: https://nca2023.globalchange.gov Chapter Website: https://nca2023.globalchange.gov/chapter/1 NCA5 Atlas: https://atlas.globalchange.gov Figure captions can be found in the slide notes of this deck Social media: @usgcrp, #NCA5
  • 3. 3 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov How the United States Is Addressing Climate Change The effects of human-caused climate change are already far-reaching and worsening across every region of the United States. Rapidly reducing greenhouse gas emissions can limit future warming and associated increases in many risks. Across the country, efforts to adapt to climate change and reduce emissions have expanded since 2018, and US emissions have fallen since peaking in 2007. However, without deeper cuts in global net greenhouse gas emissions and accelerated adaptation efforts, severe climate risks to the United States will continue to grow.
  • 4. 4 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov How the United States Is Experiencing Climate Change As extreme events and other climate hazards intensify, harmful impacts on people across the United States are increasing. Climate impactscombined with other stressorsare leading to ripple effects across sectors and regions that multiply harms, with disproportionate effects on underserved and overburdened communities.
  • 5. 5 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Current and Future Climate Risks to the United States Climate changes are making it harder to maintain safe homes and healthy families; reliable public services; a sustainable economy; thriving ecosystems, cultures, and traditions; and strong communities. Many of the extreme events and harmful impacts that people are already experiencing will worsen as warming increases and new risks emerge.
  • 6. 6 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov The Choices That Will Determine the Future With each additional increment of warming, the consequences of climate change increase. The faster and further the world cuts greenhouse gas emissions, the more future warming will be avoided, increasing the chances of limiting or avoiding harmful impacts to current and future generations.
  • 7. 7 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov How Climate Action Can Create a More Resilient and Just Nation Large near-term cuts in greenhouse gas emissions are achievable through many currently available and cost-effective mitigation options. However, reaching net-zero emissions by midcentury cannot be achieved without exploring additional mitigation options. Even if the world decarbonizes rapidly, the Nation will continue to face climate impacts and risks. Adequately and equitably addressing these risks involves longer-term inclusive planning, investments in transformative adaptation, and mitigation approaches that consider equity and justice.
  • 8. 8 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.1. Climate change presents risks while action to limit warming and reduce risks presents opportunities for the US.
  • 9. 9 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.2. Increasing capacities and decreasing costs of low-carbon energy technologies are supporting efforts to further reduce emissions.
  • 10. 10 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.3. Cities and states are acting on climate change, with a substantial increase in new activities underway since 2018.
  • 11. 11 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.4. Different scenarios of future carbon dioxide emissions are used to explore the range of possible climate futures.
  • 12. 12 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.5. The US has warmed rapidly since the 1970s.
  • 13. 13 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.6. Current climate conditions are unprecedented for thousands of years.
  • 14. 14 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.7. The US now experiences, on average, a billion-dollar weather or climate disaster every three weeks.
  • 15. 15 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.8. Lower-income urban neighborhoods experience higher surface temperatures.
  • 16. 16 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.9. Losses due to floods are projected to increase disproportionately in US Census tracts with higher percentages of Black residents.
  • 17. 17 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.10. Increasing flooding puts more people and assets at risk.
  • 18. 18 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov
  • 19. 19 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.12. Employment gains in electrification and renewable energy industries are projected to far outpace job losses in fossil fuel industries.
  • 20. 20 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.13. When or if the US reaches a particular level of warming depends on global greenhouse gas emissions from human activities.
  • 21. 21 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.14. What would 3.6属F (2属C) of global warming feel like in the United States?
  • 22. 22 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.15. At higher global warming levels, the US will experience more severe climate impacts.
  • 23. 23 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Figure 1.16. Reaching net zero by 2050 in the US will involve a mix of reductions in greenhouse gas emissions and increases in carbon dioxide removal.
  • 24. 24 Chapter 1 | Fifth National Climate Assessment | nca2023.globalchange.gov Chapter Team Federal Coordinating Lead Author Allison R. Crimmins, US Global Change Research Program Chapter Lead Alexa K. Jay, US Global Change Research Program / ICF Chapter Authors Christopher W. Avery, US Global Change Research Program / ICF Travis A. Dahl, US Army Corps of Engineers Rebecca S. Dodder, US Environmental Protection Agency Benjamin D. Hamlington, NASA Jet Propulsion Laboratory Allyza Lustig, US Global Change Research Program / ICF Kate Marvel, Project Drawdown Pablo A. M辿ndez-Lazaro, University of Puerto Rico Mark S. Osler, National Oceanic and Atmospheric Administration Adam Terando, US Geological Survey Emily S. Weeks, US Agency for International Development Ariela Zycherman, NOAA Climate Program Office
  • 25. 25 Recommended chapter citation Read the full chapter nca2023.globalchange.gov @usgcrp usgcrp GlobalChange.gov Connect with USGCRP: Jay, A.K., A.R. Crimmins, C.W. Avery, T.A. Dahl, R.S. Dodder, B.D. Hamlington, A. Lustig, K. Marvel, P.A. M辿ndez-Lazaro, M.S. Osler, A. Terando, E.S. Weeks, and A. Zycherman, 2023: Ch. 1. Overview: Understanding risks, impacts, and responses. In: Fifth National Climate Assessment. Crimmins, A.R., C.W. Avery, D.R. Easterling, K.E. Kunkel, B.C. Stewart, and T.K. Maycock, Eds. U.S. Global Change Research Program, Washington, DC, USA. https://doi.org/10.7930/NCA5.2023.CH1 https://nca2023.globalchange.gov/chapter/1