Climate Change: Greenhouse Forecasting Still Cloudy

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Science  16 May 1997:
Vol. 276, Issue 5315, pp. 1040
DOI: 10.1126/science.276.5315.1040

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A year and a half ago, an international panel suggested that global warming had arrived. But as negotiators prepare to gather in Bonn in July to discuss a climate treaty that could require nations to adopt expensive policies for limiting emissions of greenhouse gases, many climate experts caution that it is not at all clear yet that human activities have begun to warm the planet--or how bad greenhouse warming will be when it arrives.