Nature is an incredibly complex, evolving system, and we usually are not certain how several phenomena take place. Those who say they are certain are demonstrating their personal belief, not the state of their knowledge. Our record in the past, for example managing national parks, is humiliating. Also efforts at forest-fire suppression are a well-intentioned disaster from which our forests will probably never recover. Boreal forests actually depend on forest fires for spreading seeds and cleansing the undergrowth.
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