The acrid smell of charred wood still permeates the air as Sasha Berleman, a fire ecologist, and I walk along a dirt path up through the middle of a canyon in the Bouverie nature preserve in Sonoma Valley. On the left side, the earth is black as tar, and scorch marks as tall as a person scar the trunks of the mature oak trees scattered throughout the field. But on the right side, the ground is tan and brown, and you have to look hard at the still-green oaks to see any evidence of the fire that raged through here just a few weeks before. It’s no mystery to Berleman why the fire behaved so differently on the two sides of the trail at Audubon Canyon Ranch’s Bouverie Preserve. When flames hit the field on the left of the path, they met a dense wall of thigh-high grass that hadn’t been mowed, grazed or burned for 20 years. The flames must have been 5 or 6 feet tall. On the right side, however, Berleman had set a prescribed burn just this spring. So when the October wildfire hit, patches of fire blazed, but with so little fuel, the flames remained only inches high. For more than a century, people have been snuffing out fire across the West. As a result, forests, grasslands and shrub lands like those in the Bouverie reserve are overgrown. That means that, when fire escapes suppression, it’s more destructive. It kills more trees, torches more homes and sends far more carbon into the atmosphere, contributing to climate change. The devastating fires that hit Bouverie and a large swath of Northern California’s wine country in October killed 42 people and destroyed nearly 7,000 buildings. In California’s Sierra Nevada in recent years, megafires have burned at much greater severity than those forests ever saw in the past, killing trees across large landscapes and unleashing enormous quantities of carbon. The remedy, Berleman and many other scientists say, is to reintroduce fire to the landscape by allowing more natural fires to burn and setting controlled burns when weather conditions minimize the risk of a catastrophic blaze.
Read More: Climate Desk