Incredible Phytoplankton

Phytoplankton are small organisms that drift around in all aquatic environments. They are important because they create about 50-85% of the world's oxygen, and they are the basis of aquatic food chains. Phytoplankton numbers are affected by pollution and climate change. We talk to Dr John Beardall and Dr Martino Malerba of Monash University about their research into phytoplankton.