Holocene Chiltern is a landscape refurbishment project based at HS2 Chiltern Tunnel Southern Portal and its surroundings. The project is taking the opportunity of HS2 development to deliver a climate-adaptable green infrastructure that could work in the long-term.

The proposed design site is approximately 300 hectares, in which half of the site has been variably affected by HS2 development. The first ambition is to undertake soil restoration and refill damaged land in a sustainable way.

Secondly, restoring the deforested woodland and enhancing the ecological connection by creating green corridors. Lastly, turning half of the site into a rewilding area, bringing biodiversity back to the site to levels last seen at the beginning of the Holocene era.