International recognition of seaweed blue carbon... Expansion into carbon trading modelThe IPCC officially approved blue carbon, highlighting South Korea's strength in seaweed forests. The spread of green algae threatens the fishery base. The carbon trading system for seaweed forests is under consideration. The international community has declared '2050 carbon neutrality' to limit the rise in global average temperature to within 1.5℃, and is setting national greenhouse gas reduction targets (NDC) and promoting various reduction efforts and activities to achieve these targets. To achieve greenhouse gas reduction targets, it is necessary to reduce emissions from the use of fossil fuels and expand 'carbon sinks' that absorb and store already emitted carbon.