Read this paragraph to find the main idea.

Million of acres of forest are burned each year by careless campers. When you are camping in the forest, clear a place for a fire, surround it with rocks, and always put your fire out. Flood it with water or dirt. Poke the fire to be sure it is out before you leave.

Do not make fires in the forest.
Do not go camping when the forest is dry.
Be careful with fire in the forest.