Absolutely, and that's always been a fundamental component. In a few weeks I'm moderating a policy panel with the European Union in Munich on that very subject. With retrofits, you only get periodic times in the life cycle of a building to really work on the fundamental efficiency of the building, and then the key is to invest wisely so that you don't lock in emissions through half-measures. If you're going in and improving the envelope of the building, it's going to stay there for a long time. If you only go halfway, you've locked in high emissions. On the cost, once you're going in and redoing the cladding and so on, it doesn't cost much more to do it well. It costs a lot of money to do it, but not much more to do it well.
On February 8th, 2018. See this statement in context.