

GIGA-rated materials are official ratings produced by GIGA's experts and are typically the best-available options. Designers should look here first. Using the best-available materials signals intent and drives green market competition.
User-rated materials are unofficial ratings produced by users. They are open source and can be edited by all users.
Quantifying vs. Qualifying
Quantifying Sustainability: Too Many Decimals
Precisely quantifying the greenness of materials and products is a valuable science – but it is one that requires intensive time and resource inputs. It is thus accessible to overwhelmingly few materials.
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Life Cycle Analysis (LCA)