This document summarizes information about the ozone layer. It describes the location and thickness of the ozone layer in the stratosphere. It discusses the key scientists who discovered the ozone hole and identified chlorine as the main cause of ozone depletion. The document also outlines the chemical process by which ozone is created in the stratosphere and how certain man-made chemicals like CFCs erode the ozone layer. Finally, it lists some of the harmful effects of ozone depletion on humans and emphasizes the importance of the Montreal Protocol in reducing ozone-depleting chemicals to allow the ozone layer to recover by 2050.