The article discusses the significant increase in dissolved organic carbon (DOC) concentrations in freshwater draining from upland catchments in the United Kingdom over the past 12 years, attributed to rising temperatures. The study found that DOC concentrations have increased at 20 out of 22 sites in the UK Acid Waters Monitoring Network, with an average annual increase of 5.4%. This increase is linked to the export of DOC from peatlands, which are significant sources of aged, terrestrial DOC. The thermal responses of peatland phenol oxidase, an enzyme that regulates carbon storage, were studied, showing that higher temperatures lead to increased activity and DOC release. The authors suggest that global warming could further enhance the export of DOC from peatlands to the oceans, highlighting the importance of investigating the fate of this material in recipient ecosystems.The article discusses the significant increase in dissolved organic carbon (DOC) concentrations in freshwater draining from upland catchments in the United Kingdom over the past 12 years, attributed to rising temperatures. The study found that DOC concentrations have increased at 20 out of 22 sites in the UK Acid Waters Monitoring Network, with an average annual increase of 5.4%. This increase is linked to the export of DOC from peatlands, which are significant sources of aged, terrestrial DOC. The thermal responses of peatland phenol oxidase, an enzyme that regulates carbon storage, were studied, showing that higher temperatures lead to increased activity and DOC release. The authors suggest that global warming could further enhance the export of DOC from peatlands to the oceans, highlighting the importance of investigating the fate of this material in recipient ecosystems.