What trees might be good for coppicing in zone 4? Our local spruce forest is dying because of stresses from climate change. Even when it is healthy, though, the native spruce, cottonwood and birch are not very good for firewood. I want to find species that are 1) grow fairly rapidly, 2) can survive in our funky light distribution in south-central Alaska, and 3) provide better BTU return as firewood than paperbark birch and cottonwood. Any suggestions?