CO2 for meat from NZ: Shipping + last mile
CO2 for locally produced meat: last mile
How is meat from NZ producing less CO2 than locally produced?
Local: Farm -(1)-> Farmer's market -(4)-> Consumer's home
National: Farm -(1)-> Distribution center -(3)-> Supermarket -(4)-> Consumer's home
International: Farm -(1)-> Harbor/Distribution center of producing country -(2)-> Harbor/Distribution center of consuming country -(3)-> Supermarket -(4)-> Consumer's home
Where (1) is the farmer's pickup truck, (2) is a massive high-seas-capable container vessel, (3) is the 18-wheeler and (4) is the consumer's audi.
Yes, (2) and (3) may be vastly more efficient in CO2 per transported item - but it doesn't change the fact that they happen in addition to (1) and (4).