The laboratory from where carbon dioxide measurements have been taken since 1958 A.D., which form the basis of present global warming data base is :

The Mauna Loa Observatory in Hawaii is the site where continuous atmospheric carbon dioxide (CO2) measurements began in March 1958 [t1][t3]. Initiated by Charles David Keeling of the Scripps Institution of Oceanography, these measurements form the 'Keeling Curve,' which is the most widely recognized record of human impact on the Earth's atmosphere [t5][t6]. The observatory is located at 3,350 meters above sea level on the north flank of the Mauna Loa volcano, providing a remote location ideal for measuring background atmospheric levels [t4][t7]. This data set proved that CO2 levels were rising annually due to fossil fuel combustion, establishing the foundational database for modern global warming research [t6][t8]. While other observatories like Maragheh (historical astronomical) or Griffith (public astronomical) exist, they are not the source of this specific long-term climate record [t3].

Sources

1. [1] https://gml.noaa.gov/ccgg/trends/
2. [2] https://en.wikipedia.org/wiki/Keeling_Curve
3. [3] https://www.usgs.gov/observatories/hvo/news/volcano-watch-mauna-loa-observatory-keeling-curve-recognized-landmark
4. [4] https://education.nationalgeographic.org/resource/keeling-curve/