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Salomé et Félicien, deux collégiens particulièrement bavards, doivent préparer un exposé. Peu réjouis à l'idée de devoir travailler sur cet exercice, il leur est distribué un sujet des plus mystérieux : « A l'aube de la sixième extinction ». Menant des tentatives de réflexion plus vaines les unes que les autres, ils sont bientôt épaulés par Iris, une jeune scientifique rencontrée par le plus heureux des hasards. Celle-ci, spécialiste de sujets environnementaux , va ouvrir les deux adolescents à l'étendue de ses connaissances, en leur décrivant la richesse de la biodiversité et les conséquences de l'exploitation intensive des ressource énergétique et alimentaires. À son contact, ils vont se sensibiliser à des questions environnementales plus que jamais d'actualité, pour devenir ensuite, à leur échelle, les porte-paroles de l'urgence à sauver notre planète.
Situé entre la Côte d'Ivoire, le Burkina Faso et le Togo, le Ghana héberge le Parc national de Mole, avec ses 5000 Km2, est l'un des plus vastes d'Afrique de l'Ouest. Il abrite 742 espèces de plantes, 90 espèces de mammifères, 334 espèces d'oiseaux, et quelques 120 espèces de papillons. Une biodiversité précieuse que s'efforcent de protéger une équipe de 150 rangers... Troubs interroge la population qui vit aux abords du parc sur leur rapport à la nature, au monde animal. En visitant le parc, beaucoup d'écoliers aperçoivent pour la première des éléphants, alors que ceux-ci font pourtant partie intégrante des dangers que leurs enseignent leurs parents, souvent des petits agriculteurs. Et pour les rangers, le danger vient plutôt des braconniers. Comment l'équilibre avec le monde sauvage est-il maintenu malgré la déstabilisation de toute la région sur les plans écologique, climatique, économique et sécuritaire ? Reprenant son sac à dos de routard-dessinateur, Troubs part au Ghana pour une enquête sur l'exemplaire Parc National de Mole, où coexistent humains et faune sauvage. Un voyage au coeur d'un des plus vastes parcs animaliers d'Afrique de l'Ouest, au milieu des éléphants, des zébus et des kapokiers qui culminent à 70 mètres !
Quelque part entre les "Souvenirs entomologiques" de Jean-Henri Fabre et l'émission « Silence, ça pousse » sur France 5, Simon Hureau raconte par le menu comment il a peu à peu redonné vie à son jardin abandonné à la friche par son ancien propriétaire. Sans connaissances particulières sur le sujet, l'auteur, avec beaucoup de recherches, de passion et d'huile de coude, parvient à recréer à partir d'un no-man's land une véritable oasis de biodiversité, et témoigne ainsi des capacités de résilience de la nature, pour peu qu'on lui file un coup de main. Un livre d'autodidacte érudit, passionné et passionnant.
