As of Friday, California estimates that it's had "one of worst wildfire disasters in state history." According to Business Insider, at least 31 people have died, 3,500 homes and buildings went up in flames and hundreds are still missing. What's the cause of these disastrous fires? Business Insider says that climate change, including strong winds, higher temperatures and a longer wildfire season, plays a role. But reportedly so do people. Business Insider explains, "Human settlement in wildfire-prone areas also increases fire risks," citing carelessness as a factor.