Portrait of Dr. William Holland, Head of Oceanography at the US National Center for Atmospheric Research (NCAR). Holland works within the Climate and Global Dynamics Division at NCAR, studying the links between ocean dynamics and climate. Holland is seen here standing in front of a computer model of water salinity in the Atlantic Ocean. It is thought that one effect of global warming will be an increase in the salinity of the world's oceans. This would have a disastrous effect on marine life, threatening entire ecosystems. Photographed at NCAR in 1991.