 I've rarely been so excited by any conference. I think there was so much. However much you go to lots of conferences, which I do, and however much you work internationally on climate change, which I do, I don't think I've ever been to a conference which has had so many, opened up so many new perspectives on ways forward, new visions of where we could be. It was extraordinary bringing together so many different perspectives over the last two days in terms of ideas about the changing city, technology in the city, the green city. But getting all those voices in one place, it's been fantastic. I mean, I learned a huge amount and so to me, walking in yesterday morning and walking out this afternoon, my whole perspectives have changed. So I thought it was terrific. I was very interested in a lot of the dialogue, particularly the dialogue between industry and government. I thought that that was really well achieved with the input of academia kind of influencing the agenda as well and making people think about social consequences and the ethical consequences of all this technological development. That's the first time that I'm taking part of this conference and I think it was very, very interesting. I found it was not enough to talk about smaller cities and the behaviour of the people and more about organisations and I would really feel that they have to concentrate on that. The obvious thing that for me was missing, that I thought that there was a mismatch between the global geographic distribution of the urban age and where these questions are really pertinent and who was in the room and what were the dominant debates, which were still essentially Anglo-Saxon with some exceptions. So, you know, I understand the reason for that at being in London and so forth, but I think that that was obviously something that, you know, a better balance could have been achieved. But it was a stimulating, almost overwhelming experience, just the amount of data, the amount of ideas, the amount of experiments, the perspectives and in that sense it was tremendously successful. We need to completely rethink about the models that have been applied in the past and one thing is for sure to understand the very big difference between the cities of the developed world and the cities in the developing world because there I think we have a very big shift in agenda on how to tackle the problem. Risk management and identifying security for risk management for cities in the future was a key subject that came up again and again and of course the use of how technology can play its role and the big discussion is it really technology as the saviour or technology as the element, the tool to help us achieve what we want to achieve and I think there may be people of difference of opinions. The architects building buildings is not designing cities and we can't leave planning cities and designing them up to architects or to planners. We've got to make room for people to make their own spaces in between the buildings. How that's done I have no idea but that's the only way to build a city. What if there is a sea level rise? What if there's another hurricane? What if the urbanisation is so rapid and the city is not fit for purpose? So we need to think about these things so all city leaders, all the world over and institutions need now I think to have their vision this is the direction we want to go in and as Juan Carlos said we've got to get that vision right. The vision of urbanisation at the moment for most of the world is not right. This was the best urban age conference of all the ones I've been to, I haven't been to all of them but I think it just gave pragmatic advice and a very positive vision of where our cities could head with some harsh realities and it's really up to these kind of conferences to share the lessons, set the vision and get on with the business of getting stuff done.