Climate change is occurring, is caused largely by human activities, and poses significant risks for-and in many cases is already affecting-a broad range of huma

Chapter 10: Human Alteration of the Atmosphere of the eBook Understanding Physical Geography. This eBook was written for students taking introductory Physical G

The warming of the Earth has been the subject of intense debate and concern for many scientists, policy-makers, and citizens for at least the past decade. Clima

Chapter 30: Human Alteration of the Biosphere of the eBook Understanding Physical Geography. This eBook was written for students taking introductory Physical Ge

Climate change is one of the defining issues of our time. It is now more certain than ever, based on many lines of evidence, that humans are changing Earth's cl