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The 2014 World Cities Day Challenge: champion your city’s best idea

The World Cities Day Challenge will be held on 31 October and you have until 26 September to enter. It is calling for the best ideas from cities around the world – one idea, pioneered by your city, that other cities should adopt. And you could be the person to represent your city on the big day.

12 of 17: Taking the green highground in New York.

Green space in cities is vital for environmental sustainability. But converting unused urban areas into green space can not only bring environmental benefits, it can also encourage social interaction and an improved sense of place, as team member Mayra Hartmann explores in this, our 12th article in our series of 17 Sustainable Ideas for COP17.