Are you interested in natural habitat and ecology? One of the first books ever written about the environment is "A Sand County Almanac' by Aldo Leopold, published in 1949.
Beginning with a beautifully written description of the seasonal changes in nature and their effect on the delicate ecological balance, the book proceeds to examples of our interference and expresses the philosophy that stresses the need for wild spaces; not just for animals but for us as well.
Aldo Leopold said, "A land ethic changes the role of homo sapiens from conqueror of the land community, to plain member and citizen of it. It implies respect for his fellow members and also respect for the community as such."