Arthur Kay is the founder and CEO of Bio-Bean, an award winning clean energy company that recycles old coffee grounds into advanced bio-fuels. Arthur chanced upon the beautifully simple idea while he was studying for a degree in architecture, and kicked off the company just a few days after he graduated. Very soon, he had raised several million pounds in private funding and built an expert team with decades of combined experience in the energy industry. Today, the waste from one in ten of the UK's cups of coffee goes through Bio-Bean's factory. 

In this episode, Arthur tells us how ideas mean nothing without execution, about the danger of being labelled a “green” entrepeneur, and how he hopes to hack the world’s major cities, one problem at a time.