As part of the Great Big Green Week, the campaigners travelling around Wales to highlight climate and nature emergencies. A momentous day as thousands of Marsh Fritillary caterpillars are put back in the landscape of Llantrisant Common. We hear how the Usk County Agricultural Show was the only one in Wales, this year, to open to the public. Fermenting pickle in Monmouthshire to help prevent food waste. And Nevern Castle in Pembrokeshire undergoes a renaissance.