Human carelessness, such as leaving campfires unattended or discarding cigarettes improperly, is the leading cause of forest fires in the United States.

In tropical rainforests, natural causes such as lightning and volcanic eruptions are the primary causes of forest fires.

Drought conditions, which are common in Mediterranean climates, can increase the risk of forest fires by drying out vegetation and making it more flammable.

Lightning is the primary cause of forest fires in boreal forests, which are located in high-latitude regions.

Human carelessness, such as leaving campfires unattended or discarding cigarettes improperly, is a common cause of forest fires in temperate forests.

Lightning is the primary cause of forest fires in grasslands, which are characterized by open, grassy areas.

Human carelessness, such as leaving campfires unattended or discarding cigarettes improperly, is a common cause of forest fires in shrublands.

Natural causes such as lightning and volcanic eruptions are the primary causes of forest fires in tundra regions, which are located in high-latitude regions.

Natural causes such as lightning and volcanic eruptions are common causes of forest fires in peatlands, which are characterized by waterlogged, organic soils.

Natural causes such as lightning and volcanic eruptions are the primary causes of forest fires in mangrove forests, which are located in coastal areas.

Natural causes such as lightning and volcanic eruptions are common causes of forest fires in cloud forests, which are located in mountainous regions.

Natural causes such as lightning and volcanic eruptions are the primary causes of forest fires in temperate rainforests.

Lightning is a common cause of forest fires in savannas, which are characterized by open, grassy areas with scattered trees.

Natural causes such as lightning and volcanic eruptions are the primary causes of forest fires in chaparral shrublands, which are characterized by dense, evergreen shrubs.

Lightning is a common cause of forest fires in temperate grasslands, which are characterized by open, grassy areas with scattered trees.