6a. Take action to avoid the possibility of serious or irreversible environmental harm even when scientific knowledge is incomplete or inconclusive.

If we are completely serious about being ‘carbon free’ we need to rethink the design of our buildings on a large scale.

Forty-five per cent of all CO2 emissions on the planet come from heating, lighting, cooling and ventilating our buildings.

Craig White, Founder and Director, ModCell

What excites me particularly about the ModCell system is that you can make it commercial. And you use local materials, local craftsmen and root the construction in the communities that are going to live in the buildings built from it.

Kevin McCloud, designer, writer and presenter of Grand Designs

If we are completely serious about being ‘carbon free’ we need to rethink the design of our buildings

ModCell is a novel and innovative building system that brings the benefits of straw bale construction into the mainstream of the construction industry. Unlike conventional building materials ModCell timber-framed straw bale panels sequester and store significant quantities of atmospheric carbon dioxide in addition to providing exceptional levels of insulation.

The system employs farm-based temporary 'flying factories', which produce panels using locally sourced materials as close as possible to the building site, significantly reducing the impact of transportation.

The system, already used for building schools and houses, could make large-scale, carbon-capture a commercial reality in parts of the world where straw is just an agricultural by-product.

6. Prevent harm as the best method of environmental protection and, when knowledge is limited, apply a precautionary approach.