Cross-curricular series centred on sustainability and climate change, with hands-on projects linking science and design and technology. What are the problems and challenges we face around the world when it comes to the cities we live in? How can we create enough living spaces and transport networks without contributing to climate change and habitat destruction? Interactive 'Solve It!' design challenges give readers the information they need to develop sustainable solutions to the problems discussed, and step-by-step 'Test It!' activities encourage them to explore putting principles into practice.