One of the biggest threats to the eco-system caused by land pollution is chemical contamination. Plastics, toxins in wastes like anti-freeze and other chemicals seep into the ground where they remain. Many modern day chemicals and materials either do not biodegrade or break down, or if they do, then break down into smaller chemical particles. These particles poison the ground itself. Plants growing in the ground, animals that eat the plants and even humans are all affected by these chemicals. This can lead to the loss of some types of plant and animal life as well as create long-term health problems such as cancer in humans.