Landlubbers likely fail to appreciate that photosynthesizing organisms in Earth’s oceans supply half of the oxygen we breathe. Single-celled phytoplankton, a million of which can inhabit a teaspoon of sea water, draw as much carbon from our atmosphere as do all plants on land. What do oceanic and terrestrial life systems share and how are they interdependent? Join “Down on the Farm” host Tom Willey and aspiring Oceanographer-Astrobiologist Patrick Monreal in conversation.