Source: NASA Goddard Media Studios[12-Oct-2009] One tiny marine plant makes life on Earth possible: phytoplankton. These microscopic photosynthetic drifters form the basis of the marine food web, regulate carbon in the atmosphere, and are responsible for half of the photosynthesis that takes place on this planet. Earth's climate is changing at an unprecedented rate, and as our home planet warms, so does the ocean. Warming waters have big consequences for phytoplankton and for the planet. Learn more about these tiny organisms in this NASA video and explore how changes in climate have consequences for phytoplankton and the planet.