I am a current graduate student studying structural engineering and am working on a report for Carbon emissions during phases A1-5. I am new to the topic and I was hoping I could get some guidance. Are there any organizations/government agency/code references that state or set the standards for the CO2 emission? Similar to how IBC and ASCE set design standards for structural design. I see different organizations like Carbon Leadership Forum and Architecture 2030. I believe if an owner wants a LEED certified building it must meet certain standards. But not all buildings are required to be LEED certified.