I made this lamp using a newel post and stair spindle taken from a building about to be demolished.
Wood building materials produce the least amount of carbon, with brick and tile, aluminum, and concrete emitting noticeably higher levels. Using reclaimed wood keeps forests intact, allowing them to act as natural carbon sinks, further reducing the amount of carbon in the environment
https://www.terramai.com/blog/building-materials-combat-climate-change/