Almost 90% of all the forest fires are caused by humans. Carelessness and ignorance of humans has put the world on fire many a times. These so called "civilised animals" exploit forest in order to turn it to their advantage and end up giving way to a catastrophe. 

https://www.linkedin.com/posts/fete-foundation-5492a11b8_climatechange-amazonrainforest-biodiversity-activity-6835925993883078656-4NFk/