News of the WeekGLOBAL WARMING

Draft Report Affirms Human Influence

Science  28 Apr 2000:
Vol. 288, Issue 5466, pp. 589-590
DOI: 10.1126/science.288.5466.589a

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For the past several years, an international panel of climate scientists has been testing alternatives to the idea that people are affecting global climate, but none of the factors they examined fit the past century's observed warming as well as did an increase in greenhouse gases generated by human activity. So last week, the group, the United Nations-sponsored Intergovernmental Panel on Climate Change, released the draft of a new report concluding "that there has been a discernible human influence on global climate." If those words hold up under further expert and governmental review, they would be the strongest official pronouncement yet that human-induced warming is real.