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Overcrowded cities are spawning increasingly lawless suburbs. Waste is accumulating in and around them, straining the capacity to deal with it.

We are losing our environment so rapidly.

Let's clean up our environment. Let's clean up our bodies, but most importantly, let's not permit our babies of the future to be polluted before they are even born.

Many cities end up putting off things because they want to understand everything. They don't understand that innovating is about starting. Taking care of a city is a process that you start, and then give the population space to respond.

When we realize we can make a buck cleaning up the environment, it will be done!

I think its time to change and balance the environment and growth. If we don't do that, we're going to suffer a hard landing one day very soon.

By 2050, seven out of ten people will live in cities, which will account for six billion people living in urban areas. That phenomenon is central to all the challenges humanity faces. If there is an issue to be addressed, then it is certainly happening in cities and therefore must be considered on an urban scale.

I always thought we had an environmental problem, but I hadn't realized how urgent it was. James Lovelock writes that by the end of this century there will be one billion people left.

If managed well, urbanization can create enormous opportunities: allowing innovation and new ideas to emerge, saving energy, land and natural resources, managing climate and the risk of disasters.

Until we're educating every kid in a fantastic way, until every inner city is cleaned up, there is no shortage of things to do.