COVER False-color image of plant life on Earth as observed from space with the Sea-viewing Wide Field-of-view Sensor (SeaWiFS). On land, greens indicate abundant vegetation, and tans show relatively sparse plant cover. In the oceans, blue areas are the least biologically productive, whereas green, yellow, and red areas represent progressively greater productivity. Since September 1997, SeaWiFS has measured light absorption by land plants and phytoplankton chlorophyll biomass in the oceans, providing a basis for quantifying biospheric photosynthesis. See page 2594 [Image: SeaWiFS Project, NASA/GSFC, and ORBIMAGE]

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