When it comes to redeveloping old buildings, green designers face two choices: replace existing structures with modern, energy efficient buildings or refurbish and avoid the embodied energy and waste of demolition and new construction. Lenny Antonelli visited a redeveloped convent in Booterstown, County Dublin that combines the best of both approaches.

Mario Cucinella architects have produced an interesting theoretical prototype for a low cost sustainable home, dubbed 'Casa 100k'.

The redeveloped low-energy social housing at York Street in Dublin's south inner city will be officially opened next Monday, May 25.

Plans for the world's first 'eco city' appear to be dead in the water according to Fred Pearce's excellent Greenwash column in the Guardian.