Keeling curve

/ˈkilɪŋ kɜv/ (say 'keeling kerv)

noun
a graph curve which tracks the reduction of CO2 in the atmosphere in the northern spring, followed by the increase of CO2 in the autumn, the whole cycle being marked by a gradual overall increase in CO2 in the atmosphere.
{named after US climatologist Charles Keeling, 1928–2005, who created the graph in the 1950s}

Australian English dictionary. 2014.

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