In a word - Disappointing.
I am a believer in the principles of Deep Ecology, treating every living organism and all forms of life as having the intrinsic right to exist, separate from their usefulness to mankind. I am also quite well acquainted with ecological concepts and the interconnectedness of living and non-living things on Earth. But when the discussion begins to veer towards the spiritual and intangible feelings of 'oneness' with other creatures I begin to tune out. The author is undoubtedly highly educated and intelligent judging from his qualifications both as an MD and psychiatrist, and also artistically gifted in the realm of poetry. Perhaps there is some truth in the concept of psychic connections between all living things in what he calls a 'mindfield', my understanding of quantum physics being just too shallow to comprehend its repercussions. In any case, he did not succeed in convincing me.
Other than one or two chapters that dealt with more tangible subjects like the evolutionary history of life and humans, the others took effort from me not to lose focus as they dwelt on the metaphysical and spiritual aspects of nature that make up 'ecological intelligence'.
The author also makes the sharp contrast between hunting for food and trophy hunting, the latter which he abhors and the former he finds acceptable and even highly respectable. While the qualities needed to track and hunt wild animals may indeed be admirable, we must not forget the extinction of megafauna everywhere man had set foot outside of Africa, as we ate our way around the world until we were forced to settle down and become farmers.