This week, we meet Mobisol – a German solar energy business with an awesome business model for scaling up clean energy use across Africa. And if they can get drones to deliver units in remote villages and towns, the game changes forever.

Plus, we play 'Lovable Brand or Fake Corporate Imitation', catch up on Kansas City's new sustainable streetcar, get to grips with Mars' new energy commitments and find out whether The Simpsons can actually teach your kids to care for the planet.