Question

what causes forest fire

Answer 1

air pollution we can't get medicine and foods

Answer 2

Major Causes of Forest Fires

The major cause of forest fires in the United States is human activities. This can be carelessness such as not putting out a campfire or dropping a lit cigarette. It may also be arson, which is setting a fire on purpose and is against the law. Around 80% of forest fires in the United States are caused by humans.
Most fires that are started by natural causes are started by lightning. Other natural causes include volcanic eruptions and sparks from falling rocks.