in the us the majority of homes are built primarily of wood and the current inventory of wood structures in the us is estimated to store billion metric tonnes of carbon equivalent to billion metric tonnes of carbon dioxide maximizing the use of wood in multifamily housing lowrise residential construction and remodelling in the us could result in a carbon storage benefit of about million metric tonnes of carbon dioxide annually which is equivalent to taking million automobiles off the road howe et al the eco platform is working to harmonize national epd systems based on the iso standard for environmental declarations and the en standard for constructionsector epds the first eco platform epds aligned to the harmonized procedures were issued in october