Extreme weather will surely have its own chapter in the turbulent history of 2020. The human and economic toll of Covid-19 was already enormous this fall, when it became clear that 2020 was on track to break the previous record for big weather disasters, fueled in part by climate change. From the derecho that battered the Midwest with hurricane-force winds to unprecedented wildfires that scorched more than 700,000 acres in Colorado and gave California its worst fire season in history, weather and climate events like these represented only a few line items in the latest tally of the nation’s billion-dollar disasters.