What should be the carbon footprint of an average adult?

There is no standard Carbon Footprint for an average adult. This is mainly because, Carbon Footprint heavily depends on the individuals habits and lifestyle choices.

Still, it is estimated that the carbon footprint for an average adult may range from 4 to 25 Tons of CO2 emissions.

You can estimate your carbon footprint at : https://greensutra.in/greenpedia/carbon-footprint/carbon-footprint-estimator/