Look at the photographs of various cities - which of them show signs of a sustainable city? Visit Future Cities to remind yourself about what makes a city sustainable.

• In what ways do some of these cities show signs of sustainability?
• Would it be difficult to put these examples of sustainable development into practice in other cities?

• In what ways do they show actions that are unsustainable?
• In each case, what might happen in the future if things are allowed to carry on like this?,/font>
• What advice would you give the city planners to make these cities more sustainable?
• Which would be most difficult to change for the better, and why?

Click on the pictures for larger versions.

Singapore © Simon Scoones/Worldaware Integrated Transport System, Curitiba, Brazil © Paul Smith/Panos Pictures

Slums in Nairobi © Betty Press/Panos Pictures

Solar panels to power a radio station © Mali Crispin Hughes/Panos Pictures

A housing project in Philippi township, Cape Town © Eric Miller/Panos Pictures

A busy street in Tokyo © Mark Henley/Panos Pictures

Telephone wires in Delhi © Chris Stowers/Panos Pictures

A market scene, London © Living Streets www.livingstreets.org.uk

Rubbish piled up in Venice © Daily for Press/Rex Features A waterfall in Manchester © Living Streets www.livingstreets.org.uk