"In a NASA study, scientists have concluded that when the Earth's climate warms, there is a reduction in the ocean's primary food supply, posing a potential threat to fisheries and ecosystems. By comparing nearly a decade of global ocean satellite data with several records of Earth's changing climate, scientists found that whenever climate warmed, marine plant life in the form of phytoplankton declined. Whenever climate cooled, marine plant life became more vigorous or productive."
Available at the site is a video Ocean Biology, 1997-2006
Scientists now have nearly a decade's worth of data showing the cycle of plant life in the Earth's oceans. From space, the “ocean color” satellites measure the ocean's biology as plant productivity. In this visualization, high plant productivity is represented in green, while areas of low productivity remain blue. Data were collected by the Sea-viewing Wide Field-of-view Sensor (SeaWiFS). Credit: NASA/GeoEye