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Trees may have vibrant inner lives and certainly appear to have individual personalities, claims the forester-cum-writer Peter Wollheben. In his bestselling book, The Hidden Life of Trees, he uncovers an underground social network of communication between trees.

In the late 1990s the journalist Ruth Pavey purchased four acres of scrub woodland in Somerset, and set about transforming this derelict land into a sanctuary for woodland plants, creatures and her own thoughts.

The natural world comes alive in the poetry of Kathleen Jamie. Although her landscape is often her Scottish homeland, politics, history and human folly are never far \\naway, as she asks how we can live more equably with nature.

And breathing clean air is the goal of Gary Fuller\\u2019s book, The Invisible Killer. He studies the rising threat of air pollution from London\\u2019s congested streets to wood-burning damage in New Zealand.

Producer: Katy Hickman