Coming Soon: The Third National Climate Assessment USGCRP expects to release the Third National Climate Assessment within the next few weeks. Stay tuned to globalchange.gov or follow USGCRP on Facebook and Twitter for updates.

The public review period is now closed; over 4,000 public comments were received and are being addressed by the authors. The National Academy review is complete and can be read here. The public review draft remains available below while the report is revised by the author teams. Thank you for your interest in the National Climate Assessment.

A 60-person Federal Advisory Committee (The "National Climate Assessment and Development Advisory Committee" or NCADAC) has overseen the development of this draft climate report.

The NCADAC, whose members are available here (and in the report), was established under the Department of Commerce in December 2010 and is supported through the National Oceanic and Atmospheric Administration (NOAA). It is a federal advisory committee established as per the Federal Advisory Committee Act of 1972. The Committee serves to oversee the activities of the National Climate Assessment. Its members are diverse in background, expertise, geography and sector of employment. A formal record of the committee can be found at the NOAA NCADAC website.

The NCADAC has engaged more than 240 authors in the creation of the report. The authors are acknowledged at the beginning of the chapters they co-authored.

Following extensive review by the National Academies of Sciences and by the public, this report will be revised by the NCADAC and, after additional review, will then be submitted to the Federal Government for consideration in the Third National Climate Assessment (NCA) Report.  For more information on the NCA process and background, previous assessments and other NCA information, please explore the NCA web-pages. The NCA is being conducted under the auspices of the Global Change Research Act of 1990 and is being organized and administered by the Global Change Research Program.

To simply access and read the draft report, please download the chapters below. However, if you would like to submit comments on the report as part of the public process, you will need to enter the “review and comment system” and register with your name and e-mail address and agree to the terms.  All comments must be submitted through the review and comment system.

In addition to the draft report below, you may also be interested in the following documents which provided input to the NCA:

Download Chapters of the NCADAC Draft

Climate Assessment Report! 

Provide Comments on the Report!


Download the Full Report* (warning, 147Mb. Very large file)

Between chapters, there are some page numbers that are not used. This is intentional and does not reflect missing pages.


or download each chapter separately:

Cover page*

Introduction: Letter to the American People

1. Executive Summary

2. Our Changing Climate

Introduction to Sectors

3. Water Resources

4. Energy Supply and Use

5. Transportation

6. Agriculture

7. Forestry

8. Ecosystems, Biodiversity, and Ecosystem Services

9. Human Health

10. Water, Energy, and Land Use

11. Urban Systems, Infrastructure, and Vulnerability

12. Impacts of Climate Change on Tribal, Indigenous, and Native Lands and Resources

13. Land Use and Land Cover Change

14. Rural Communities

15. Interactions of Climate Change and Biogeochemical Cycles

Introduction to Regions

16. Northeast

17. Southeast and Caribbean

18. Midwest

19. Great Plains

20. Southwest*

21. Northwest

22. Alaska and the Arctic

23. Hawaii and the U.S. Affiliated Pacific Islands

24. Oceans and Marine Resources

25. Coastal Zone Development and Ecosystems

Introduction to Response Strategies

26. Decision Support: Supporting Policy, Planning, and Resource Management Decisions in a Climate Change Context

27. Mitigation

28. Adaptation

29. Research Agenda for Climate Change Science

30. The NCA Long-Term Process: Vision and Future Development

Appendix I: NCA Climate Science - Addressing Commonly Asked Questions from A to Z

Appendix II: The Science of Climate Change

* These files were changed on Monday, Jan 14 to correct the color coding on Figure 20.3 in the Southwest chapter and to correct the affiliation for one of the NCADAC committee members. The correct versions of the files were available on the Review and Comment system when it went live at 9am EST, January 14.

Between January 14th and April 12th only: Please go to the Review and Comment System to provide comments on the draft.


You must register and accept the terms in the Review and Comment System in order to review this document. Comments will only be accepted through this system.

NOTE: You will not be allowed to create an account in the system prior to 9am ET January 14th, 2013, and the comment period ends at 5pm ET on April 12th, 2013






































Between chapters, there are some page numbers that are not used. This is intentional and does not reflect missing pages.