claim: The Keeling curve, which is widely used to show the increase in CO2 emissions, is based on data from the top of Mount Mauna Loa in Hawaii.
evidence: Keeling’s Tellus article of 1960 presented the first monthly CO 2 records from Mauna Loa and Antarctica ( 1957 to 1960 ), finding a “distinct seasonal cycle…and possibly, a worldwide rise in CO2 from year to year.” By the 1970s, it was well established that the increase of atmospheric carbon dioxide was ongoing and due to anthropogenic emissions.