This document discusses the various causes and effects of air pollution. It notes that air pollution is bad for the environment and is causing harm to polar bears and people's health, increasing risks of heart and lung disease. Various actions are recommended to reduce air pollution, such as recycling, riding bikes more often, using less power plants and private cars, and developing wind and solar energy. The thinning of the ozone layer from air pollution also harms living things. In conclusion, the document calls on people to help save the world by addressing air pollution.