Environmental Unknowns

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Science  21 Jul 1995:
Vol. 269, Issue 5222, pp. 358-360
DOI: 10.1126/science.269.5222.358


Among the environmental problems ahead, the most important ones could be those that are still unknown to us. This conceptual article explores this prospect on the grounds that it is important not only to supply answers to recognized questions but to raise appropriate new questions.