There are two ways of calculating this criterion.
1. Option 1: the BREEAM Green Guide assessment tool
The BREEAM Green Guide provides designers and specifiers with advice on how to make the best environmental
choices when selecting construction materials and components. In the Green Guide, building materials and components
are assessed in terms of their environmental footprint over their complete life cycle - from ‘cradle to grave', within
comparable specifications. This assessment provides a rating: from A+, the lowest overall environmental impact, to
E being the worst performance overall.