Precious is interested in ocean biogeochemistry, mainly working on the ocean carbon cycle and ocean deoxygenation. Seeking to understand processes that regulate oceanic CO2 uptake in the present climate, climate change impact on the ocean CO2 sink and efficiency, and implications on the biosphere. Recently started working on ocean deoxygenation within the context of marine ecosystems using metabolic theory. He uses ocean circulation models, in-situ measurements, and Earth system models to study the earth system.