I'd be delighted if that were to happen, impractical though it might be. Only if every product and company had to do the same, including all their externalities. That would both incentivise and enable people to shop and invest wisely. Colour code and grade them just like EU energy efficiency labels - which were so successful in pushing to higher efficiency they had to re-rate them all.

Right now it's almost impossible to know the impact of what you buy, or which is better. Or how the impact of some produce available year round varies across the year. I know buying a lettuce in winter is going to have larger impact than in summer, but I have no way to quantify it.

It would also be an excellent starting point for building a carbon tax, that could slowly escalate to punitive.