Leyla Kazim reports from cork country in Portugal - where up to 10,000 of hectares of cork oak trees are being lost every year, despite laws protecting them from being cut down. Climate change is putting new stresses on the ancient forests, and as the cork industry worries that falling wine consumption could shrink global demand, Leyla asks why Portugal became the world’s biggest producer of cork in the first place, and what it will take to keep them thriving. She meets farmers using regenerative methods of working the land to protect the montado, and plantations where thousands of new trees are being planted. Presented by Leyla Kazim Produced in Bristol for BBC Audio by Natalie Donovan