A general interest introduction to the field of ecology, the book's topics range from carbon basics to environmental ethics. "My aim is to help readers understand how ecology — unraveling the mysteries of the Earth's intricate and interconnected processes — can help chart a sustainable course for humans and other life on Earth," Freeman says. In the past, she's written on ecology and environmental topics for The Earth Institute at Columbia University, Union of Concerned Scientists, Natural Resources Defense Council, and other informed audiences with a strong, often professional interest in the topics.