I did think of that, but then also thought that since oceanic plant life move around with currents, they wouldn't be deprived of sunlight all the time. But yes,

I did think of that, but then also thought that since oceanic plant life move around with currents, they wouldn't be deprived of sunlight all the time. But yes, as you point out, nobody knows all the consequences. It sounds like they're actually doing research and experiments to validate their idea, so whatever model they use will hopefully take these kinds of secondary and tertiary effects into account.