In contrast to substantial studies and established knowledge of aluminum (Al) effects 2 (mainly toxicity) on freshwater organisms and terrestrial plants, and even on human 3 health, only a few studies of Al effects on marine organisms have been reported, and our 4 understanding of the role of Al in marine biogeochemistry is limited. In this paper, we 5 the role of Al in the stimulation of phytoplankton growth and carbon sequestration in the 1 ocean depths. 2