How do they find the exact cause of massive forest fires?

For every degree that our planet warms, the forest needs a 15 percent increase in precipitation to compensate for increased dryness. (See how megafires are remaking American forests.) Similar to the case in Northern California, investigators believe that Canada's boreal forest fire was caused by humans. read more

Forest fires always start by one of two ways - naturally caused or human caused. Natural fires are generally started by lightning, with a very small percentage started by spontaneous combustion of dry fuel such as sawdust and leaves. read more

Logging cables and friction/sparks have caused fires to ignite during logging operations. However many logging operations have fire fighting apparatus on-site. Loggers are very aware of the hazards and risks. If a fire starts during operations they do respond. They have knowledge of the woods. read more