Why do pipes pollute the earth?

What caused slow erosion of Appalachian? What do cars with petrol engines have in their exhaust system to reduce the amount of carbon monoxide unburned hydrocarbons and nitrogen oxides in their exhaust gases? What carbohydrate is the most immediate energy source for all living things? What are the environmental issues the people face in urban areas? What was the purpose of the Ku Klux Klan? i wish there was a way to make a working giant plane? What is a Immigration? Where did the oil spill place take place? An important result of the haymarket riot was that it? How do environmental pressure groups try to protect the environment? How does windmills impact the environment? Could littering affect your community? In what year was the Salvation Army founded? How does peer pressure play a role in Shakespeare's Macbeth? What are some the different types of pollutants? What are the risks of Deforestation? What effects of child labor did the earl of shaftesbury see during his factory visit? How did Oscar Peterson impact on society? What happens when censorship leads to coverups or distortions? Why do people buy trees?