This radio broadcast discusses how scientists' views of global warming have changed since the subject first emerged some 20 years ago. Topics include the nature of the warming process, once thought to be a gradual ratcheting-up, but now considered to be more unpredictable; the development of more powerful computers and more sophisticated modeling programs; the complex nature of the atmosphere, with many sources of secondary feedbacks; and the lack of data for areas (for example, Africa) that may have a strong influence on climate changes. The clip is 2 minutes in length.
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