Adam Walton travels the South Wales valleys with geologist and writer Ted Nield to discover how ancient veins of rock could give clues to the planet's future.
Discover 11,128,835 listings and 279,596 playable programmes from the BBC
Adam Walton travels the South Wales valleys with geologist and writer Ted Nield to discover how ancient veins of rock could give clues to the planet's future.
Comprehensive News and Sport, the latest information and the best entertainment for Wales.
