Logging increases bush flammability for 30 years, research shows We’re sorry, this service is currently unavailable. Please try again later. Dismiss Normal text size Advertisement Logging of native forests makes them much more flammable and elevates the severity of bushfires when they occur, pushing some species closer to ecological collapse, according to a review of published science by two leading universities. The meta-study – which assessed 51 peer-reviewed papers – found logging increased the severity of forest fires from about 10 years after the trees are extracted with effects lasting more than three decades. Selective logging or thinning can also increase fire risks, according to the Bushfire Recovery Project, a joint project between Griffith University and the Australian National University.