On Episode 9 of The Overstory we go birding with Jason Ward, an impassioned birder in Atlanta, Georgia whose enthusiasm and social media savvy is helping to attract younger and more ethnically diverse groups of people into the world of bird-watching. We also hear from climate activist Patrick Houston about his tips for social change, and talk with Haviland Whiting, the youth poet laureate of Nashville. Plus: Ms. Green discusses the challenges of being a vegan.