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How do human activities cause a forest fire?
Lightning, volcanic eruptions, sparks from rockfalls, spontaneous combustion, underground coal fires and even just throwing a lighted cigarette can ignite wildfires. In areas where there are many dried up leaves and trees, throwing a lighted cigarettes might just cause these to burn out of control. Many are started by arson, such as slash-and-burn, which is considered the least expensive way to clear land for future use such as farming crops. Flammable grasses caused by overlogging also contribute to the ease of igniting wildfires. Lightning, volcanic eruptions and such, which produces heat and even light, can cause the forests to catch fire and spread all over.
How do ecosystems become unbalanced?
In the environment, everything is reusable and replenishable but at a certain rate. The certain rate is the much environment can balance itself. Overly consume or damage would break the balance beyond the point of restorable. For the example of imbalance. Fish is replenishable goods of seas. However, near shore fishery using fishing net cause damage to corals where fish would breed and thus imbalance in the environment. This imbalance would results to extinction and no more fish for fishing.
