Overview6 copies each of all three reading levels, 18 books total. Pollution is a growing problem around the globe. Using chemicals, old appliances, exhaust fumes, and plastics are just a few of the things that cause pollution on our planet. Pollution examines how water, soil, and the atmosphere have become increasingly polluted and the impact that pollution has on people's health. In the face of these challenges, people and countries have cooperated to clean up natural environments. They are also working to prevent pollution through technology, better planning, transportation alternatives, and more.