As per the relevant Compliance Note, the Green Guide to Specification can be used to demonstrate compliance with Option 1, as the Green Guide is a compliant LCA tool.
However, Option 2 is an elemental approach, for which the Green Guide cannot be used, as robust environmental performance information for the specific new element needs to be provided.
The Green Guide to Specification only provides generic rating and for this reason it cannot be used to demonstrate compliance with Option 2 criteria.
