Then there's transportation, refrigeration, distribution, point of sales... all with their cost. Are we still so sure the 'savings' is significant?
I see the idea of marginal cost is getting through. But consider all the costs to get a real sense of how the origination marginal cost contributes.
And don't dismiss transportation. It has to get home from the grocery store, in that 10-burger one-person vehicular trip through city traffic. That's a marginal cost too.
Here's some data I just Googled:
Car trips: 0.34 metric tonnes of CO2 / 1000 miles
Burgers: 0.5 metric tonnes / year of burgers (150)
Producing meat is very-much commensurate with other marginal activities associated with procuring meat, like trips to the grocery store.I'm done here.