Importance of algae and nutrients, on PBS Nova program

[SantaMonica]

The "Earth From Space" two hour program is one of the rare general-audience programs that spends a lot of time on algae (they call it phytoplankton) and nutrient conversion:

https://www.youtube.com/watch?v=aU0GhTmZhrs
http://www.pbs.org/wgbh/nova/earth/earth-from-space.html