The Habitable Planet: A Systems Approach to Environmental Science SeriesThis series begins with an overview of the Earth's systems — geophysical, atmospheric, oceanic, and ecosystems — as they exist independently of human influence. Following this introduction, the series explores the effect that human activities have on the different natural systems. Topics include human population growth and resource use, increasing competition for fresh water, and climate change. Each of the 13 programs features two case studies following top scientists in the field.