Guy Stewart Callendar

      Callendar was born in February 1897, Montreal, Canada. Callendar was the second son of Victoria Mary Stewart and physicist hugh Longbourne callendar. Callendar was introduced to science and technology as a young person because his parents were rich.  Callendar Identified in 1938, the link between the artificial production of carbon dioxide and global warming, later called the Callendar Effect. He collected world temperature measurements and suggested that this warming was related to carbon dioxide emissions. He was one of Britain’s leading engineers, author of the standard reference book of tables and charts on the properties of steam at high temperatures and pressures. Callendar focused on research into batteries and fuel cells and expanded on the work of several 19th century scientists.  In 1938, he compiled measurements of temperature from the 29th century on, and correlated it with the old measurements of atmosphere of atmospheric  CO₂ concentration. He concluded that over fifty years global land and temperature had increased and could be explained as an effect of the increase in carbon dioxide. Callendar most significant and original scientific contribution was in climatology. His dominant opinion was that at current atmospheric concentrations carbon dioxide already absorbed all the available long-wave radiation. Therefore any increase would not change the radiative heat balance of the planet but might augment plant growth. His papers convinced some other scientists of the need to conduct an organised research programme on CO2 concentration in the atmosphere leading to Mauna Loa measurements which proved pivotal to advancing the theory of anthropogenic global warming.