Upon re-reading the whole "Food" section, it feels to me like it's a summary of a much more comprehensive calculation. He starts out by ascribing 7,500 kWh/yr to "direct energy in food transport and handling". Later there's another 900 kWh/yr for "annual biological energy uses for growth and maintenance of a human" which may or may not include fossil fuel fertilisers and the systems that produce and distribute them. It's hard to tell. His English is a damn sight better than my Swedish though, so i'm not complaining.
Later he acknowledges that "In these figures, the energy use in agriculture is not included", but i can't follow what he means by the ratios and numbers that follow that statement (and i've plenty of practice with energy research).
So i'm gonna take the "picture is worth a thousand words" approach and use the graph ;-)
|