Influence of temperature and elevated carbon dioxide on the production of dimethylsulfoniopropionate and glycine betaine by marine phytoplankton

► We monitored the influence of T and CO2 on the marine osmolytes DMSP and GBT. ► Diatoms and prymnesiophytes showed a uniform pattern for GBT regulation. ► The regulation of DMSP production is more complex with strain dependent variability. ► Synergetic effects of elevated temperature and CO2 were observed for DMSP production. ► The study has major impact on considerations of the ocean of the future.