Tree Huggers

I agree, the points in this article are about clean energy, not the ability to continuously refresh a resource as you deplete it, however, to play devil's advocate:

Wood, specifically, is not likely renewable at a sufficient rate. i.e. it is impossible to grow enough wood to meet any significant energy requirements. While it is technically renewable, if we treat it as such, we will deplete resources faster than we can replace them.

This is a silly argument I am making, and requires a narrow definition ignoring other bio-fuels which, while unproven at scale, would potentially remove CO2 from the atmosphere.