[zitsarethecure]

If you read the marketing content on their site, the intended method of recycling these structures is to cut up the wood sections and re-use them as structural beams in regular building construction. They aren't grinding them up or melting them down or anything like that. So between the lifespan of the tower and the buildings built (or maintained) with the recycled beams, the useful lifespan of the materials used are long enough to grow new wood to replace them. At least that's my understanding.