The emphasis on urban water problems has arisen from the heavy weight of the urban populations in the political process and, in general, their more active role in politics.

UNESCO: EDUCATION

And one way of doing that is to create what's called an infrastructure bank where at least a certain amount of infrastructure money, particularly for new projects, would be guided by some clear criteria, a lot of transparency, engineers and urban planners and city planners involved in the process so that we can also get some regional planning.

WHITEHOUSE: Creating New Jobs by Investing in High-Speed Rail

But now the process is being reversed - Greeks are moving in the other direction, away from urban financial hardship as the effect of the crisis deepens.

BBC: Journey across crisis-hit Greece

But from planting the bamboo in the Zambian forests to shipping the bicycles to the concrete urban jungles across the world, the process of manufacturing the bikes is far from an easy task.

CNN: Made in Africa: Bamboo bikes put Zambian business on right track