Constructing a Typology of H 2 in Cities and Regions An International Review Mike Hodson, Simon Marvin and Andrew Hewitson, Centre for Sustainable Urban and Regional Futures University of Salford Cube Building 113-115 Portland Street Manchester Tel: +44 (0)161 295 4018 Fax +44 (0)161 295 7100 Email: M.Hodson@salford.ac.uk www.surf.salford.ac.uk Tuesday, 18 December 2007