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Cities are the origins of global warming, impact on the environment, health, pollution, disease, finance, economies, energy are all problems that are confronted by having cities. That's where they - all these problems come from.

Cities are not static objects to be feared or admired, but are instead a living process that residents are changing all the time.

There are three major issues now that are becoming important, not only for cities, but for all mankind: Mobility, sustainability - which is linked to mobility - and social diversity.

I believe in the city as a natural human environment, but we must humanize it. It's art that will re-define public space in the 21st Century. We can make our cities diverse, inspirational places by putting art, dance and performance in all its forms into the matrix of street life.

I want to describe the psychological state of the people in a certain city.

Cities can be the engine of social equity and economic opportunity. They can help us reduce our carbon footprint and protect the global environment. That is why it is so important that we work together to build the capacity of mayors and all those concerned in planning and running sustainable cities.

One city can look at other cities relative to their city and learn something. It's a matter of sharing the patterns of what exists in one society based on landscape or cultural values versus other cities.

As architects we are often involved in the concrete-steel-and-glass aspect of it, but cities are social structures, and to be involved in imagining the future of cities and the type of relationships and the types of places that we're making is something that intrigues me very much.

As the world's 'most dynamic' cities seek to manage their own urban growth, American state and local officials have much to offer. Our mayors can share their experiences in urban design, clean energy projects, Smart Grids, codes for energy efficient buildings, transportation safety, and innovative environmental solutions.