* He says the energy input is very large. I say it's reasonable for it to be so, because it's converting a cheap form of energy into a valuable one
* He says it is CO2-intensive because of the large energy inputs. I say this is just a reflection of the whole energy economy being CO2-intensive; that in principle the inputs can be CO2-free, and so biofuels can be CO2-neutral. (And they unique in this aspect; there is no other way to make CO2-neutral hydrocarbons, short of chemically scrubbing CO2 from the atmosphere.)
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More than one thread:
* He says the energy input is very large. I say it's reasonable for it to be so, because it's converting a cheap form of energy into a valuable one
* He says it is CO2-intensive because of the large energy inputs. I say this is just a reflection of the whole energy economy being CO2-intensive; that in principle the inputs can be CO2-free, and so biofuels can be CO2-neutral. (And they unique in this aspect; there is no other way to make CO2-neutral hydrocarbons, short of chemically scrubbing CO2 from the atmosphere.)