In Spring 2010 Hamburg's International Building Exhibition will mount a major presentation of its plans, publicising projects and making it possible for the first time to examine construction sites. The key themes will be cosmopolis - the question of co-existence in our increasingly international cities; metrozones - access to conceivable new urban spaces, and urban centres and climate change and the issues of suitable solutions and resource conservation. This publication explores the background of each project location and IBA's projected solutions.