The extent of high-severity burn has important consequences. The majority of a large burned landscape could remain devoid of conifers for decades. Ecologists who monitor field plots in the Sierra Nevada have observed that high-severity fires tend to produce more high-severity fires. So we’re losing oak forest at the same time.”Land managers have two primary tools to try to stop severe forest fires from recurring: thinning and prescribed fire. Officials are still mapping how much of the record-breaking four-million-plus acres that burned in California this year succumbed to severe fire.