Trees, argues scientist and author Diana Beresford-Kroeger, are the most important organisms on earth. Chemically affecting the environment more than any other life form, trees provide food, create medicine, and most importantly, the life-giving oxygen without which Earth's breathable atmosphere would cease to exist.

"Call Of The Forest: The Forgotten Wisdom Of Trees" follows Beresford-Kroeger as she investigates humankind's biological and spiritual connection to forests. From the sacred sugi and cedar forests of Japan to the great boreal forests of Canada, her global journey explores the science, folklore, and restoration challenges of this essential eco-system, which is disappearing at a rate of more than one hundred and forty square kilometres of forest per day.

Backed by an international cast of experts in deforestation and reforestation, Beresford-Kroeger calls for massive reforestation—a global efforts she believes is necessary to halt global warming. But at its heart, the film proposes a simple strategy for each viewer to combat climate change: planting trees in their own yards and neighborhoods.