This document discusses ozone layer depletion and global warming. It provides background on the discovery of the ozone hole over Antarctica in the 1970s. It explains that CFCs released into the atmosphere destroy ozone molecules, causing depletion. Depletion increases harmful UV rays, damaging aquatic and terrestrial ecosystems, and harming human health. The document also discusses evidence that the world is warming due to human activities like greenhouse gas emissions. Effects include rising sea levels, melting glaciers and ice sheets, and shifts in animal habitats and plant/animal ranges. Solutions proposed include reducing energy use, switching to renewable energy sources, and international cooperation on emissions standards.