To me it is amazing what Konstantin Kirsch is doing. Since many years he is experimenting how to build houses with living trees. On his chanal om Youtube you will find a lot of videos on his project Naturbauten. There is also a book that is sold out, but perhaps in wintertime it will be available again. You can arrange visits to his place to see the buildings or to take part in workshops he is offering. You will find more information on his website: www.naturbauten.org.
In the warm summertime it is nice and fresh inside of the buildings. A wonderful idea to live without leaving trash on the planet!! These buildings will just be gone with no traces left behind.
Konstantin Kirsch has also a blogBLOG with a lot of links to other related themes.