Brochure de Schulthess sur la durabilité
Go clean Go green
Go clean Go green
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Propreté<br />
durable.<br />
Consommation d'énergie kWh/kg<br />
1975<br />
0,49<br />
1985<br />
1991<br />
2006<br />
0,30<br />
0,25<br />
0,17<br />
Aujourd'hui<br />
0,08