Having worked on the periphery of biomass stuff up till 2000, I'd have to disagree.
In many areas stumps aren't allowed to be buried since they can lead to voids when they rot away.
One place I did some work for built machines to process the stumps.
Another in NJ used the machines. Nearly all their wood came from either dead trees or trees removed during construction of housing or malls etc. The rest came from clean construction debris. They made mulch. (He charged people to dump their stumps etc then charged them a few weeks later for the same stuff when they bought mulch..)
Another was a town that used biomass in a sewage treatment/power plant.
Semi-treated water out, mixed with mulch and allowed to sit for some time. Some got used for mulch on town properties, most of the rest was burned in a small power plant. The mixer was hydraulic and I went out and helped fix it.
The stuff heated up so they had to spread it out occasionally. and even then they had a minor fire almost weekly.
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