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BIOENERGY FOR EUROPE: WHICH ONES FIT BEST?

BIOENERGY FOR EUROPE: WHICH ONES FIT BEST?

128 7 Annex RME versus

128 7 Annex RME versus diesel fuel for transportation – Germany Use of fossil fuels Greenhouse effect Acidification Eutrophication Summer smog Nitrous oxide** Human toxicity** Advantages for biofuel * How to interpret the diagram Advantages for fossil fuel -1000 -500 0 500 1000 1500 2000 German inhabitant equivalents* per 100 million km The figure shows the results of complete life cycle comparisons where RME is used in passenger cars instead of diesel fuel. The results are given for a distance of 100 million km being covered by passenger cars using the biofuel instead of fossil fuel. This is equivalent to the average annual mileage of about 7,000 inhabitants of Germany. In this case for example the amount of greenhouse gas emissions that is being saved by substituting diesel fuel by RME is equal to the amount which about 700 German citizens would on average generate in one year (this is what is meant by “German inhabitant equivalents”). Remarks and conclusions The results show that both RME as well as diesel fuel have certain ecological advantages and disadvantages. • Advantages of the biofuel: use of fossil fuels, greenhouse effect • Advantages of the fossil fuel: acidification, eutrophication • Low or no significance: summer smog The data for ozone depletion and human toxicity tend to have a high uncertainty. Therefore these categories should not be included in the final assessment. (**See Chapter 4.1.2 and for details on all impact categories 3.3 and 3.4.) A further assessment in favour of or against RME or diesel fuel cannot be carried out on a scientific basis, because for this purpose subjective value judgements regarding the individual environmental categories are required which differ from person to person. 9747

7.1 Country specific life cycle comparisons 129 ETBE versus MTBE for transportation – Germany Use of fossil fuels Greenhouse effect Acidification Eutrophication Summer smog Nitrous oxide** Human toxicity** * How to interpret the diagram: Advantages for biofuel Advantages for fossil fuel -1000 -500 0 500 1000 1500 German inhabitant equivalents* per 1 billion km The figure shows the results of complete life cycle comparisons where gasoline with component ETBE from sugar beet (12 vol. % = 10 % of energy content) is used in passenger cars instead of gasoline with fossil MTBE (12 vol. %). The results are given for a distance of 1 billion km being covered by passenger cars using the gasoline with the bio-component instead of fossil component. This is equivalent to the average annual mileage of about 70,000 Germans. In this case for example the amount of greenhouse gas emissions that is being saved by substituting diesel fuel by ETBE is equal to the amount which nearly 700 German citizens would on average generate in one year (this is what is meant by “German inhabitant equivalents”). Remarks and conclusions The results show that both ETBE as well as MTBE have certain ecological advantages and disadvantages. • Advantages of the biofuel: use of fossil fuels, greenhouse effect • Advantages of the fossil fuel: acidification, eutrophication • Low or no significance: summer smog The data for ozone depletion and human toxicity tend to have a high uncertainty. Therefore these categories should not be included in the final assessment. (**See Chapter 4.1.2 and for details on all impact categories 3.3 and 3.4.) A further assessment in favour of or against ETBE or MTBE cannot be carried out on a scientific basis, because for this purpose subjective value judgements regarding the individual environmental categories are required which differ from person to person.

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