The discussion of each key message begins with a summary of recent variations or trends, followed by projections of the corresponding changes for the future.ĭevelopment of the key messages involved discussions of the lead authors and accompanying analyses conducted via one in-person meeting plus multiple teleconferences and email exchanges from February thru September 2012. The chapter presents 12 key messages about our changing climate, together with supporting evidence for those messages. Further details on the topics covered by this chapter are provided in the Climate Science Supplement and Frequently Asked Questions Appendices. Additional geographic detail is presented in the regional chapters of this report. While the focus is on changes in the United States, the need to provide context sometimes requires a broader geographical perspective. This chapter summarizes how climate is changing, why it is changing, and what is projected for the future. Scripps Institution of Oceanography, Univ. NOAA Geophysical Fluid Dynamics Laboratory NOAA Pacific Marine Environmental LaboratoryĬanadian Centre for Climate Modelling and Analysis, Environment Canada NASA Jet Propulsion Laboratory Contributing Authors
Nansen Environmental and Remote Sensing Center CICS-NC, North Carolina State Univ., NOAA National Climatic Data Center
