As the world's population rises, there is increasing evidence that human activities are having a significant impact on the weather and climate, from a local to global scale. Human Impacts on Weather and Climate is a non-mathematical presentation of the basic physical concepts of how human activity may affect weather and climate. This book assesses the current hypotheses, and examines whether the impacts are measurable. Included are: critical evaluations of the scientific status of weather modification by cloud seeding; human impacts on regional weather and climate; and human impacts on global climate, including the greenhouse gas hypothesis. Discussions also focus on the modern philosophy of science and its application to determining human impacts on weather and climate. Human Impacts on Weather and Climate will be invaluable for upper-division undergraduate and graduate courses in meteorology, geophysics, and earth and atmospheric science, as well as for policymakers and readers with an interest in how humans are affecting the atmosphere. An extensive reference list is included.