Friday marks 10 years since the side of a mountain collapsed, raced across a river and buried an entire neighborhood in rural Washington state, killing 43 people in the nation’s worst landslide disaster. Since then, young alder trees have colonized the scarred landscape and a new memorial offers perspective on the scope of the loss. The federal government has advanced a national strategy for researching and understanding the dangers landslides pose. But the sort of trauma that engulfed Oso after the slide struck on March 22, 2014, is likely to afflict more and more people as climate change intensifies storms and catastrophic wildfires, destabilizing soil and increasing risk.