He is cited as an example to be followed by the scientific experts of the International Union for Conservation of Nature, an NGO based in Switzerland, when he puts forward building systems made of wood, mostly local wood, mostly without glue, mostly well calculated, i.e. optimised according to the specifications of the buildings, with the aim of saving material so as not to waste it, even if it is a biosourced and renewable material. In his lectures, he repeats that "wood is certainly a renewable material, but it must not be wasted or soaked in toxic products". He adds that "the added value provided throughout the value chain of the wood industry, from upstream to downstream, makes it possible to guarantee jobs and social contributions that cannot be relocated.[24]