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Science 13 April 2001:
Vol. 292. no. 5515, pp. 234 - 236
DOI: 10.1126/science.1060082
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Perspectives

SUN-CLIMATE CONNECTIONS:
Earth's Response to a Variable Sun

Judith Lean and David Rind

Solar radiation reaching Earth is not constant but rather varies with time because of cyclical changes in the sun's activity. In their Perspective, Lean and Rind discuss the emerging evidence that this variability, albeit small, is translated into climatic variability on Earth. This issue is important because the solar variability signal must be distinguished from the anthropogenic signal to understand the human influence on climatic change.

J. Lean is at the E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, DC 20375, USA. D. Rind is at NASA Goddard Institute for Space Studies, New York, NY 10025, USA.

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