How do you create light from a pile of rocks? GravityLight is on a mission to bring a renewable source of light to those with no access to electricity.
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More in Make the future
What if we could capture the wind created by passing cars with roadside turbines, and turn it into usable energy?
MotionECO seeks to transform used cooking oil into sustainable biofuels that can reduce greenhouse gases.
Insolar bring together volunteers, community partners and job trainees to implement solar energy. It is supported by Shell.