Rahul Goswami likes the idea of calories delivered to the food system as a measure of productivity:
It’s high time we were liberated from that duo of malign trinities – the APY and the NPK. Area production yield is what government servants, accustomed to bland high-handedness, take recourse to when supplying ministers and macro-economists with material for annual planning, hence the longevity of APY. The other one is the close ally of APY, and its credo is “to hell with soil and plant biodiversity”.
With some references on the benefits of eating less meat.