What is the theme in A Language Older Than Words by Derrick Jensen?

Interconnection is one of the traits that Jensen indicates has been lost as a result of the current culture's opinion of the earth and its resources as inanimate objects that can be used and abused with no impact on the future. Jensen, instead, argues that the world, the plants, the animals and the humans are all interconnected. He says that when humans destroy the earth and its resources and even other humans, they are creating a ticking time bomb that will eventually come back to destroy them.