Science and sacred knowledge don't usually go hand-in-hand. But botanist and medical biochemist Diana Beresford-Kroeger is forging a path built on their collective wisdom, which she believes could help lead the way out of the growing climate crisis. She joins Steve Paikin to share her vision that's outlined in her latest book, "To Speak for the Trees: My Life's Journey from Ancient Celtic Wisdom to a Healing Vision of the Forest."