'Man's effect on the environment, questioning accepted truths, challenging those in charge and reporting on progress towards improving the world. Presenters, Tom Heap and Dr. Alice Roberts, travel the UK and the world in search of solutions to the challenges facing the natural world and the people and wildlife that live in it. Broadcast at 21.00 on Mondays, Costing The Earth runs for 27 weeks of the year, split into three series. Podcast episodes are added weekly.' (BBC Radio Four podcasts).