The secret life of the boreal forests, which extend in broad bands across North America, Scandinavia, and Eurasia. For the past 10,000 years, together with the tropical forests, they have constituted the world’s largest biome. With the expert help of scientists and ecologists, this novel journey reveals the amazing relationships between tree species: the trees communicate with each other, form alliances, and unite to confront the elements, dispelling the belief that they are solitary creatures. Furthermore, they engage in social networks that allow them to thrive in harsh climates by sharing food and water through their root systems. How much longer will they resist the effects of climate change?