Caz Graham looks at new eco-friendly farming techniques at Aberystwyth University.
BBC Radio 4
Farming in the dark: blind children meet Caz Graham on a farm that has changed their lives
Sarah Swadling is among a million hens at a new breed of intensive egg farm, in Shropshire
Elinor Goodman's by a Dorset river, exploring how farmers are reducing pollution.
BBC Radio 4 FM only