Would it be useful to have a "foot print" for all critical resources not just carbon?
We know, for example, that computers need "rare earth" elements to run. We are rapidly running out of rare earth element supplies. This is of far more immediate concern than global warming. Don't we need a rare earth "foot print"?
How about aluminum ore, bauxite, or iron ore or endangered species, or the consumption of fish e.g. tuna and other species from the sea e.g. octopus or cuttlefish?
Should we just focus on carbon as the "only" or even the most important footprint or include other resources of even more critical importance than carbon?
Does focus on the carbon foot print draw our attention away from even more important "foot prints"?