The laboratory from where carbon dioxide measurements have been taken

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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 :

Maragheh observatory
Mauna Loa observatory
Griffith observatory
Sydney observatory
This question was previously asked in
UPSC CAPF – 2009
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The Mauna Loa Observatory in Hawaii is the site where continuous measurements of atmospheric carbon dioxide concentration began in 1958, forming the basis of the Keeling Curve and a key dataset for understanding global warming.
The Keeling Curve, named after Charles David Keeling, shows the steady increase in atmospheric CO2 concentration since the late 1950s, along with seasonal fluctuations. This is one of the most important pieces of evidence for anthropogenic climate change.
The Mauna Loa Observatory is operated by the National Oceanic and Atmospheric Administration (NOAA). Its remote location on a volcanic mountain top minimizes local pollution influences, making it an ideal site for monitoring global atmospheric composition.

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