Last week the Ashden Awards participated in the RIBA event series 'International Dialogues on architecture and climate change', arranging for three of our past UK winners to make presentations to the audience, followed by a time for questions and discussion.

The aim of the evening was for the speakers to present how, if they were the Government Minister responsible for zero carbon new buildings, they would ensure that targets for delivering zero-carbon homes by 2016 and zero-carbon non-domestic buildings by 2019 were met.

Jonathon Porritt chaired proceedings, and brought in an international element in his opening speech, telling the audience of a recent trip to Shanghai, where he saw significant progress being made on zero carbon buildings. Architects and engineers there are often frustrated by the image that China has in the West, as they actually understand a lot about how to achieve the goal of low or zero carbon building. However, Porritt also reminded the audience that new build only represents a small fraction of energy use in buildings, and that refurbishment of existing housing stock is essential. To further this, he would like to see more use of Display Energy Certificates, placing them in prominent positions in all non-domestic buildings to highlight to visitors the energy efficiency, and 'shame' organisations into improving it.