1. Corbridge Middle School, Cow Lane, Corbridge, Northumberland NE46 4TE, UK
2. School of Engineering, Newcastle University, Newcastle NE1 7RU, UK
3. Royal Society Schools Engagement Team, 6-9 Carlton House Terrace, London SW1Y 5AG, UK
4. Tyndall Centre for Climate Change Research, Newcastle University, Newcastle NE1 7RU, UK