Marine plankton, carbon heroes!

Coccolithophores (pictured) among the phytoplankton, plus foraminifera (the most common plankton) and pteropods (tiny marine snails) among the zooplankton have one thing in common: they all use CO2 to make the calcium carbonate they need for their
skeletons. So they are vital 'carbon heroes' because, in their trillions, they are constantly removing carbon from the sea and, indirectly, the air. And the phytoplankton put oxygen back into the air; more than all the world's rainforests.