The biosourced village, circular economy, reuse

The future RE2020 environmental regulations for new construction will aim to meet the sustainability requirements of the ecological transition. Biosourced and geosourced materials are key levers for decarbonization, and offer interesting technical characteristics (insulating properties, for example). But what role will they play in construction by 2050 ? What will be the challenges in terms of availability ? Which processes and products are already mature enough to be deployed on a large scale ?