With today's ecological imperatives, contemporary architecture faces its greatest challenges since Modernism. In 2009, Denmark hosted an international summit on climate and sustainability. The Louisiana Museum is supporting this event with a major exhibition, The Future Has Arrived: Architecture for a Sustainable World, the second show in the series The Frontiers of Architecture. This exhibition catalogue presents a spectrum of new visions for sustainable global development, based upon the three parameters of economy, environment and social change, with essays by German architect Wilfried Wang, Danish philosopher Ole Thyssen and interviews with Ecosistema Urbano, Foster & Partners, Philippe Rahm and R&Sie(n).