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by detractors of the belief in global warming is also included to maintain a balance of views. A major advance since the Second Assessment Report is the increase in the range of techniques used and the evaluation of the degree to which the results are independent of the assumptions made in applying these techniques. This has increased the conï¬dence in these aspects of detection and attribution. Unfortunately, many of the sources of uncertainty identiï¬ed in the Second Assessment Report still exist. Uncertainties are present at each step of the chain from emissions of greenhouse gases and aerosols, through to the impacts that they have on the climate system and society. Further work is needed in the areas of observations, future emissions, the dominant processes and their feedbacks as a starting point. The editors admit that, although estimates have improved since the Second Assessment Report, there is still considerable uncertainty in the magnitude of natural climatic variability. This seems to be another area where further research is needed. Importance is also given to the problems of statistical downscaling, whereby regional information is gained from AtmosphereâOcean general circulation models. An innovation since the last report, possibly as a result of adverse comments by reviewers and users, is that an index, albeit rather skeletal, has been produced. It greatly improves access to information throughout the chapters. By the end of 2001, a more in-depth search facility is promised on the web at http://www.ipcc.ch. Many of the diagrams have been reproduced in colour to assist interpretation, but there are still a number that are too small or try to convey an excessive amount of information at the expense of clarity. To identify weaknesses in such a book is petty when there is so much of value in this totally revised and rewritten work. It is likely to remain a vital reference work until further research renders the details outdated by the time of the next survey. Even then, such is the output of research papers in this area, it is likely to provide the most useful starting point. PETER A. SMITHSON Department of Geography, University of Shefï¬eld Published online in Wiley InterScience (www.interscience.wiley.com). DOI: 10.1002/joc.763 THE UNITED STATES NATIONAL CLIMATE ASSESSMENT REPORTS The United States Global Change Research Act of 1990 (P.L. 101-606) requires the federal interagency committee Copyright ï 2002 Royal Meteorological Society for global change research of the National Science and Technology Council to submit periodic reports to the President and the Congress. The reports of the ï¬rst US national assessment are reviewed below. There are two reports: an âOverviewâ report containing a summary of the ï¬ndings Int. J. Climatol. 22: 1143â1147 (2002)
International Journal of Climatology – Wiley
Published: Jul 1, 2002
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