Series finale of our eco hero Duncan Stewart's show sadly tonight. I know, I know, but he'll be back again soon, alright? In this last episode Duncan looks into the 'circular economy' system, which basically involves reusing and recycling minerals taken from the ground. This makes it good for the environment, and good for the economy. He investigates what this will mean for the future of the Irish economy, and looks at areas where the changes have already started. He's just like Captain Planet really, isn't he?