BIOENERGY FOR EUROPE: WHICH ONES FIT BEST?
BIOENERGY FOR EUROPE: WHICH ONES FIT BEST?
BIOENERGY FOR EUROPE: WHICH ONES FIT BEST?
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110 7 Annex<br />
Willow versus light oil or natural gas for heat production – Denmark<br />
Use of fossil fuels<br />
Greenhouse effect<br />
Acidification<br />
Eutrophication<br />
Summer smog<br />
Nitrous oxide**<br />
Human toxicity**<br />
* How to interpret the diagram<br />
Advantages for<br />
biofuel<br />
Advantages for<br />
fossil fuel<br />
Willow vs light oil<br />
Willow vs natural gas<br />
-800 -600 -400 -200 0 200 400 600 800 1000<br />
Danish inhabitant equivalents* per 100 TJ<br />
The figure shows the results of comparisons between complete life cycles where light oil (blue rows) or<br />
natural gas (light blue) is substituted by willow for heat production. The unit refers to an amount of 100<br />
TJ of heat. This is equivalent to the average heat requirement of about 4,700 inhabitants of Denmark in<br />
one year or a willow production of about 600 ha/a.<br />
Conclusion<br />
The results show that both willow as well as light oil/natural gas have certain ecological advantages and<br />
disadvantages, depending on the parameters given highest priority. Willow has significant environmental<br />
advantages over light oil with regard to the parameters greenhouse effect and use of fossil fuels<br />
but on the other hand the fossil fuels are superior with regard to nitrous oxide and human toxicity. The<br />
other parameters show less significant result mostly in favour of fossil fuel. As mentioned, the data for<br />
human toxicity tend to have an uncertainty higher than average, and should therefore not be included in<br />
the final assessment. (**For more information on this and the other environmental parameters investigated<br />
see Chapters 3.3 and 3.4 as well as 4.1.2.)<br />
A further assessment in favour of or against willow or fossil fuels cannot be carried out on a scientific<br />
basis, because for this purpose subjective value judgements regarding the individual environmental<br />
categories are required. If the main focus of the decision maker is for example on the reduction of the<br />
greenhouse effect and the saving of energy resources, willow will be better suited. If on the other hand<br />
the parameter nitrous oxide were deemed to be most important, then light oil or natural gas would be<br />
preferred.