This is probably the best use of Christmas trees (though it’s up for debate whether it’s a good idea to cut down spruce trees to begin with).
Side note: it was hard to find this story on a website that’s not exclusive access or enshitified. Even the company who built the turbine (#Modvion) has a tor-hostile website themselves.
According to the BBC Newsroom they use glue instead of bolts to hold it together.
Even when trees die they take years to decompose, and not all of the CO2 captured by a tree will be rereleased as CO2, as the tree is decomposing the organisms consumeing the trees will incorporate some of the carbon into themselves, approximately 4%of the tree’s weight.