The U.S. is struggling to replant forests destroyed by increasingly destructive wildfires, with many areas unlikely to recover on their own. Researchers are studying which species are likely to survive — and where — as climate change makes it difficult or impossible for many forests to regrow. But researchers say the U.S. also lacks enough seed collection, seedling production and workers trained to plant them on a scale needed to stem accelerating losses. The Forest Service says the biggest roadblock is the yearslong task of completing environmental and cultural assessments and preparing severely burned land for replanting.