Increasing heat and drought are killing young pines planted on ground scorched by wildfires. Can seeds from the toughest trees grown in boot camp nurseries better endure?By Tina DeinesFour years after the Calf Canyon/Hermits Peak Fire burned 341,471 acres in northern New Mexico, the massive burn scar from the most destructive blaze in state history still holds vast stretches of leafless, barren and charred trees.