Concern is growing over the state of the Earth's nine, interdependent, "life-support systems".
Since September 2002 we have lived in Genval, Belgium. We walked by the Lac de Genval. Upon which we could walk some winters. We ate chips from the local friterie in the Place Communale.
Might a sustainable future depend upon a greater percentage of people living in cities?
More than 1 billion people live in slums around the world, a figure that the UN believes will double in the next 25 years.
A new collaborative intelligence project lets people connect and share ideas for building smarter cities.
Outer space may offer a new perspective on economic growth; as income rises, so does light usage per person.
1.2bn people now have limited access to water - a number expected to rise due to the effects of pollution, urbanisation, and climate change. World leaders are being urged to ensure that the rich/poor and urban/rural divides don't determine who has access to clean water.
Innovative uses for local community hubs such as pubs are increasing individuals' choices.
Many cities are seeing a rise in urban agriculture as a response to the growing food crisis.