On this week's ClimateCast, Tom Heap heads into the rainforest - but he didn't have to travel far. In Dartmoor, Devon, he explores a temperate rainforest dripping with a rare and lively ecosystem that only exists in regions without extreme temperatures. The rainforests are once thought to have made up 20% of Britain, but centuries of deforestation means there are just little pockets left.Joining Tom in the "green cathedral" to discuss how these fragments of forest could be saved and why they're so important to preventing climate change is author and environmental campaigner Guy Shrubsole and Dr Debbie Hemming, scientific manager of vegetation-climate interactions at the Met Office.Producer: Emma Rae WoodhousePodcast promotions producer: David ChipakupakuEditor: Paul Stanworth