Sources and sinks of co2 Sources Natural: respiration of vegetation and soil detritus Man-made: Fossil fuel combustion deforestation Sinks slow exchange of carbon between surface waters and deep layers of ocean (Seawater is alkaline while Co2 is acidic > The oceans are a vast reservoir of Co2)Sources and sinks of CO2 • Sources – Natural: respiration of vegetation and soil detritus – Man-made: Fossil fuel combustion, deforestation • Sinks: slow exchange of carbon between surface waters and deep layers of ocean. (Seawater is alkaline while CO2 is acidic → The oceans are a vast reservoir of CO2)