The book focuses attention on the different environmental and ecocritical theories as well as the waves of theoretical innovations.It also introduces the theory of Material Ecocriticism and the techniques that it uses to deconstruct literary texts in particular.Selected poems from both Joy Harjo and Gary Snyder are analysed in the light of Material Ecocriticism.The work brings together two authors intrested in Native American myths and values as well as the environmental crisis.The uniqueness of Snyder and Harjo's work can make distinctive such themes thanks to the brilliant and creative potential to deal with philosophical issues such as apocalypse and the alarming decline of living and non-living creatures.