Translate the following English sentence to French:
"With an estimated share of 15%, air transport is, of course, not the only cause of air pollution and by no means the most important. However, bearing in mind the forecast doubling of air traffic by 2015 within the EU alone, it is positively essential for the Council, the Commission and the European Parliament to take joint measures to limit the environmentally harmful impact of air traffic."
Cependant, les prévisions d'un doublement du trafic aérien, rien que pour l'UE, d'ici 2015 imposent au Conseil, à la Commission et au Parlement européen de prendre ensemble des mesures visant à limiter les effets polluants du trafic aérien.