5/5 How architects are using aiming to create zero-carbon buildings, and whole cities.
BBC World Service
Poland: still the most Catholic country in Europe?
Alan Johnston returns to the Palestinian city of Nablus - once a hotbed of militancy.
Mike arrives at the Copenhagen summit to meet delegates, laugh with Santa and alien spot.
1/2 Oana Lungescu investigates secret police files of those imprisoned or persecuted during...
2/2 Jonathon Porritt is in China, where he finds pioneering green solutions.
2/4 Robin Ince and Brian Cox are joined by Jon Ronson and Seth Shostack from SETI Institute.
BBC Radio 4
Fran Abrams examines aggressive cost-cutting in the government's forensic science service.
1/4 The myth and reality of Joan of Arc, and the other Frenchwoman who did more to save France
4/4 Owen Bennett Jones explores five crucial battles in the relationship between Christiani...