After spending many years gazing up at the stars, Hubert Reeves has turned his attention to the future of our planet. The world's friendliest and most enthusiastic astrophysicist takes us on a surprising journey, which will make us all realize how important it is to protect our environment.

Forests were home to our most distant ancestors. They show us our history and link us to our past. When we enter a forest, we step back in time and rediscover life on Earth as it once was. Thanks to recent scientific discoveries, we now know that the animal world and the plant world are more alike than we thought, and that, in their own way, trees can sense, feel, and communicate. It is up to us to ensure that forests are sustainably managed, and that all the plants and animals that live in them and make up their ecosystem are protected for future generations.

In a voyage of discovery that takes us to the bottom of the sea, Hubert Reeves explains how the oceans formed, what makes them salty, and what causes currents and tides. He reveals the wonders of life below the waves and shows us how the oceans can determine the very future of our precious planet. This is why they need our protection.