Readers of The Way of happiness, The art of meditation or Monk and the philosopher will feel at home, we find here a quick wit and generosity of Matthieu Ricard. However, it does not deliver a utopian work much less chimerical, but otherwise rigorous, objective and uncompromising. From her about hope and optimism hoped communicative in an era and a world today in full mutations; certain statements of Buddhist monk likely leave puzzled, skeptical, but each argument is supported, explained and corroborated by science, because Matthew was and remains a scientific in its approach, which remains Buddhist in form and substance: do not rely on a belief but on personal experience. This book is a paved by the number of pages but the writing is fluid, easy and always enjoyable. This book is a call to hope for a near future where awareness can and must be awakened in the interest of future generations, because if later there is still time. A heartfelt reminder that we only have one Earth, and all must agree to live, not survive.