Earth’s climate is now changing faster than at any point in the history of modern civilization, primarily as a result of human activities. Global climate change has already resulted in a wide range of impacts across every region of the United States. Oceans are warming, rising, and becoming more acidic, and heavy precipitation events occur more often leading to increased flooding along the U.S. coastline.
Below are links to reports that provide a general overview of climate change.
This report, produced by the American Meteorological Society, endeavors to bring a comprehensive set of measurements to detail the status of the climate system and our capacity and willingness to observe it. An overview of findings is presented in the Abstract. Chapter 2 features global-scale climate variables; Chapter 3 highlights the global oceans; and Chapter 4 discusses tropical climate phenomena including tropical cyclones. The Arctic and Antarctica respond differently through time and are reported in separate chapters (5 and 6, respectively). Chapter 7 provides a regional perspective authored largely by local government climate specialists. A list of relevant datasets and their sources for all chapters is provided as an Appendix.
The Climate Science Special Report (CSSR) is designed to be an authoritative assessment of the science of climate change, with a focus on the United States, to serve as the foundation for efforts to assess climate-related risks and inform decision-making about responses. This report provides: 1) an updated detailed analysis of the findings of how climate change is affecting weather and climate across the United States; 2) an executive summary and other CSSR materials that provide the basis for the discussion of climate science found in the second volume of the NCA4; and 3) foundational information and projections for climate change, including extremes, to improve “end-to-end” consistency in sectoral, regional, and resilience analyses within the second volume.
Volume II of the Fourth National Climate Assessment focuses on the human welfare, societal, and environmental elements of climate change and variability for 10 regions and 18 national topics, with particular attention paid to observed and projected risks, impacts, consideration of risk reduction, and implications under different mitigation pathways. Where possible, NCA4 Vol. II provides examples of actions underway in communities across the United States to reduce the risks associated with climate change, increase resilience, and improve livelihoods.