Ian Marchant travels on the trains that do not appear in timetables to unused stations.
BBC Radio 4 Extra
Peter Hadfield investigates the illegal trade in Siamese rosewood.
Sheep farmers push for recognition of the effects sheep dip may have had on their health.
Liz Bonnin presents the red-crowned crane from Japan and Asia.
Melting Antarctic ice sheet will not lead to as big a sea level rise as previously thought
The government's being taken to court over claims it isn't doing enough to protect rivers.
Liz Bonnin presents the eastern orphean warbler, in an olive grove near Athens.
David Attenborough and fellow experts join Tom Heap to preview the Paris Climate Summit.
Helen Mark visits Tollesbury Wick on the Essex coast.
New research on the effects of pesticides on honey bees.