The spherical refrigerator by Dutch designer Floris Schoonderbeek is buried underground, keeping food cool without using electricity.
Urinal at University of the West of England can generate electricity to power indoor lighting, which Oxfam says show potential for use in refugee camps
As the US generates 35m tons of food waste yearly, biodigesters could be big business. Harvest Power hopes to crack the code
Sainsbury’s transforms its organic waste into power-generating biomethane gas.
This mobile solar power station can instantly be installed anywhere in the world, providing electricity at the push of a button.