In reply to Timmd:
Aha you want to consider the holistic approach?
All the other products produced from the same batch of oil refined to produce the stove fuel, (Petrol, Diesel, Gas Oil, Plastics, solvents) will have a different pollution fingerprint. So you could consider these as by products of producing stove fuel, then there's oil spills, transport etc. all of which have an environmental impact.
Contrast this with the sugarcane which is produced only to manufacture alcohol there are less by products to consider and most will be non toxic. NB their process will still involve harvesting with petrol/diesel machines and processing, transport etc. This makes it hard for them to really claim their product as carbon neutral.
Therefore you could say "As long as you don't buy plastics, drive a car or use oil based paints then you are polluting less with the ecofuel" if you do all these activities then burning stove fuel has no more environmental impact than eco fuel since if you take stove fuel (meths/paraffin) and the ecofuel on their own they both burn to water and CO2.
The other issue...
I really can't fault the companys quality with respect to their attitude to pollution and global warming they're so much better than most. I'm still concerned about the WWFN approval because if they convert tracts of land to monoculture of sugarcane, in areas such as Brazil then the cost is the biodiversity of these areas with a direct impact on wildlife. Surely at odds with the WWFN's constitution?
They didn't get back to me on this issue...