Shovon presented a poster on “New estimates of the stocks of oceanic phytoplankton carbon using EO data” at the NCEO & CEOI Earth Observation Conference 2017 in Bath. This poster presented the new developments in estimating these carbon stocks using EO data. The focus was on new estimates of phytoplankton carbon using a novel ocean-colour-based method that combines cellular allometric properties and light-absorption properties of oceanic phytoplankton. The similarities and differences among various estimates of phytoplankton carbon from ocean-colour methods and biogeochemical models including data assimilation, were presented. Further challenges in obtaining the carbon stocks in various phytoplankton types, and minimizing the estimation uncertainties, were discussed.