claim: The measurements of the amount of CO2 made at the Mauna Loa Observatory are accurate and uncontaminated by any emissions from the volcano.
evidence: Since 1958, initially under the direction of Charles Keeling, followed by his son Ralph and later Elmer Robinson, Mauna Loa Observatory ( MLO ) has been monitoring and collecting data relating to atmospheric change, and is known especially for the continuous monitoring of atmospheric carbon dioxide ( CO2 ), which is sometimes referred to as the Keeling Curve.