Coppice hazelnuts and use the rods to make permanent structures, insulation etc. Not sure if one can grow nuts and coppice at the same time but nuts alone are very nutritious and wood roots sequester C.

Ha. I actually need a bunch of rods to conceal the ugly fencing around my house. Not sure I'm going to get much off my tiny patch of garden, however. I need to find myself a field to plant with hazel.