The current challenges and obstacles for cities in reaching this goal is that the scale of the challenge is unprecedented. We are talking environmental challenges when it comes to emissions, air pollution, adapting to changing climate, heat islands, water pressures and stress. We are also talking social challenges with more people moving to cities, pressure on schools, jobs, social services. Overall, the interlinkages between these different goals and priorities, creating a livable, inclusive, environmentally sustainable city, but that's also economically driving is one of the biggest challenges I think the world has seen to date and cities in particular. We need to change, do this systemic innovation we call. So we need to change not only technology, but also regulation, our fiscal system, our fiscal incentives and we also need to innovate in governance. So we need to change the whole system and that's very challenging first because it's not easy, because of mindset, because of the skills of people and also because there is a huge need of money, resources.