Once considered waste, sawdust and wood chips now in short supply (AP)
EUGENE, Ore.— It was problem waste once, sawdust and wood chips burned in countless "wigwam" burners that belched sparks and smoke through their screened-over tops at lumber mills across the West. Some of the rusting hulks remain, but they're cold now. The chips and sawdust they burned are in short supply, valuable byproducts used for fiberboard, to generate energy and more.