1. Environmental Systems Analysis, Chalmers University of Technology, Gothenburg 412 96, Sweden
2. Institute of Transport Economics, Gaustadalléen 21, Oslo 0349, Norway
3. Materials Physics, Department of Physics, Chalmers University of Technology, Gothenburg 412 96, Sweden
4. ALISTORE−European Research Institute, Rue Baudelocque, Amiens 80000, France