What are the causes of wildfires?

Humans and Wildfire

Human-caused fires result from campfires left unattended, the burning of debris, equipment use and malfunctions, negligently discarded cigarettes, and intentional acts of arson. Lightning is one of the two natural causes of fires.

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Explanation:

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d. planting trees

the trees take in carbon to make oxygen.

well, i believe that the answer is 2. : 3