> and it takes more than 600kcal to create 600kcal plus transportation into your home This is not a strong argument or at least a different area of discussion.

> and it takes more than 600kcal to create 600kcal plus transportation into your home This is not a strong argument or at least a different area of discussion. Because you can say exactly the same for the electricity: you need more than the power. You need the coal+transportation, or power plant, or solar panels ... I'm pretty sure humans are much more energy efficient ... for certain tasks ;)