Eric Wolanski received his Ph.D. in environmental engineering from the Johns Hopkins University in 1972. He is a leading scientist@the Australian Institute of Marine Science, where he studies tropical coastal oceanography and its biological implications for mangroves and coral reefs. Address for Wolanski: AIMS, PMB No. 3, Townsvile MC, Qld. 4810, Australia. E-mail: e.wolanski@aims.gov.au