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Lead is a transient tracer of anthropogenic inputs to the earth surface environment.I will show recent data from GEOTRACES cruises and regional coral and sediment data to illustrate how lead is evolving in the ocean over the past decades to a hundred years.As new sources arise(e.g.South Asia),lead increases in the upper ocean; as older sources(e.g.leaded gasoline)are phased out,lead declines over decades.