PowerPoint Presentation - Presentation at Yale University

Introduction: Do the IPCC AR4 findings constitute a “consensus” of climate science experts?

l152 Coordinating Lead Authors and Lead Authors

lAuthors were from over 30 countries

lDrafts of Working Group I Report were subjected to two rounds of review and revision

lReport was reviewed by over 650 individual experts, as well as by governments and international organizations

lIn total, over 30,000 written comments were received

lSummary for Policymakers was approved (line-by-line) by officials from 113 governments

lReport outline in Nov. 2003. Acceptance of SPM and underlying chapters in Feb. 2007


	Here is an outline of the structure of my talk.
	First I’ll discuss some of the key findings of a recent Intergovernmental report that investigated the nature and causes of climate change.
	Then I’ll define some terms that I’ll be using in my talk.
	Next I’ll try to give you some indication of the principal advances that have been made in our knowledge of the causes of climate change.
	Most of the talk will focus on discussion of one example of a so-called “fingerprint” study - a statistical comparison of patterns of climate change in observed data and in model predictions.
	Finally, in my concluding remarks, I’ll point out some of the key uncertainties in this type of work, and tell you why I believe that we all have a stake in advancing the science.