The authors assessed the combined effects of elevated CO2 and nutrients on the metabolism of a benthic community dominated by the seagrass Cymodocea nodosa (Ucria) Ascherson in a mesocosm experiment This study is one of the first investigating the effects of combined oceanic CO2 and nutrient enrichment, therefore providing critical information on how seagrass communities will respond to these changing conditions that reflect the global trend for the next decades.