"For Scientific purposes, access to these data is unlimited and provided without charge. By their use you accept that an offer of co-authorship will be made through personal contact with the data providers or owners whenever substantial use is made of their data. In all cases, an acknowledgement must be made to the data providers or owners and to the data centre when these data are used within a publication."

Commonwealth Scientific and Industrial Research Organisation, Environment and Climate Change Canada, Global Monitoring Laboratory, NOAA, Meteorological Research Institute,

Elise Guerette (CSIRO), Hidekazu Matsueda (MRI), Lin Huang (ECCC), Paul Krummel (CSIRO), Ray Langenfelds (CSIRO), Sylvia Michel (INSTAAR), Zoë Loh (CSIRO), WDCGG; All ¹³CO₂ data contributed to WDCGG by GAW stations and mobiles by 2025-08-29, (Reference date^*: YYYY/MM/DD)

* As the reference date, please indicate the date you downloaded the files.