In "Building a Greener Future", published for consultation on 13 December 2006, we set out our policy framework for moving towards zero-carbon development. In doing so, our aim is to provide certainty for the development industry and other related businesses without over-regulating the sector. With an ambitious national framework in place to strengthen building regulations, local authorities should not need to devise and impose their own detailed standards for the environmental performance of individual buildings. The draft Planning Policy Statement (PPS) on climate change, published for consultation alongside "Building a Greener Future", recognises there may be local development or site specific opportunities to justify higher levels of building performance than set out nationally. The draft PPS sets out what is expected of local planning authorities in considering and justifying any local approach.