Who was Guy Callendar?

“Guy Stewart Callendar (1898-1964) is noted for identifying, in 1938, the link between the artificial production of carbon dioxide and global warming. Today this is called the “Callendar Effect”. He was one of Britain’s leading steam and combustion engineers, a specialist in infra-red physics… and designer of the burners of the notable World War II airfield fog dispersal system, FIDO. He was keenly interested in weather and climate, taking measurements so accurate that they were used to correct the official temperature records of central England and collecting a series of worldwide weather data that showed an unprecedented warming trend in the first four decades of the twentieth century. He formulated a coherent theory of infrared absorption and emission by trace gases, established the 19th century background concentration of carbon dioxide, and argued that its atmospheric concentration was rising due to human activities, which was causing the climate to warm”:

[James Rodger Fleming, The Callendar Effect (2007), p. xiii}

see Paul website under Writings.

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