Long the exclusive purview of chemical agents, sick waters are responding to natural fixes. The Journal of Geophysical Research reports on a University of Miami Rosenstiel School of Marine and Atmospheric Science study showing nearly half the dust in Miami on summer days originates in Africa. Transoceanic winds bring the dust, which is high in iron content. The dust nears the EPA's allowable limits for airborne particulates. The Kesterton National Wildlife Refuge near Merced has shown a dramatic increase in certain mice and voles possessing both male and female reproductive organs.
Scientists suspect that the cause is of environmental, rather than genetic, origin.
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