Zero-carbon definition – a highly efficient building that uses no on-site fossil fuels and produces on-site, or procures, enough carbon-free renewable energy to meet building operations energy consumption annually.
 Just two materials, steel and concrete, are responsible for about half of the industrial sector and 20% of all global CO2 emissions.
  Minimum of 40% reduction below the product category average emissions (global warming potential) if available. This can be accomplished through design and/or material selection.
 The reduction (cradle to gate) considers all activities starting with the extraction of materials from the earth (the cradle), their transportation, refining, processing and fabrication activities until the material or product is ready to leave the factory gate.