"Residence time for CO2 is only 5 to 7 years. It is then recycled back into sinks such as plants, oceans and soils. Some studies show recycle time is only 12 months"
Only if the system is in balance.
If it isn't, say because humans are adding more CO2 than the environment can "consume" the residence time blows out to over a hundred years.
"Anyway, when oceans warm they release CO2 into the atmosphere;"
which further increases the temp, which further increases water vapour levels which further increases the temps
