As humanity advances, so too does its reliance on energy to support that advancement. The only question is, do you pick the harder long term solution or do you take the easy way out and cut a few corners for expediency?

This week Paddy and Tricia watch as The Doctor and Jo get involved in a struggle between these two ideologies, as well a struggle closer to home. Can they save both the future of humanity and their own future from The Green Death?