Garbage that is not properly disposed of causes health problems for humans and animals by spreading germs, bacteria, and destroying habitats. There are gases in the Earth’s atmosphere that stop some of the heat from escaping into space. These are called greenhouse gases. Some human activities such as cutting down and burning trees result in the greenhouse gases increasing in the environment and can be harmful. In the book, The Plant Warrior, Freddie and Bert learn that a little trash can result in a BIG problem! POs: Download Order Form