Ricardo Letelier and Peter Fiekowsky know that phytoplankton created the oxygen in our atmosphere. Now maybe they can help us again by removing CO2 from the atmosphere and sending it to the ocean depths. But do phytoplankton respire it out too quickly for that to work? And would a good new volcano do what Mt. Pinatubo did: cool the planet by feeding the phytoplankton and making them multiply and take our more carbon dioxide? For the video, audio podcast, transcript and comments: https://tosavetheworld.ca/episode-592-tiny-green-things.