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 energy we use? How can we make the most of renewable energy sources and find alternative forms of fuel? 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.