Mild-mannered biker triggered a huge debate over climate change – in the early 20th century
Sylvia G. Rice, Assistant Professor of Earth, Environmental and Planetary Sciences, Rice University. In 1938, a British engineer and amateur meteorologist made a discovery that set off a fierce debate about climate change. Scientists had known for decades that carbon dioxide could trap heat and warm the planet. But Guy Callendar was the first to connect human activities to global warming. He showed that land temperatures had increased over the previous half-century, and he theorised that people were unwittingly raising Earth’s temperature by burning fossil fuels in furnaces, factories and even his beloved motorcycles. When Callendar published his findings, it set off a firestorm. The scientific establishment saw him as an outsider and a bit of a meddling gentleman scientist. But, he was right. His theory became widely known as “the Callendar Effect.” Today, it’s known as global warming. Callendar defended his theory until his death in 1964, increasingly bewildered that the science met such resistance from those who did not understand it. Building on over a century of climate science A theoretical basis for climate change had been developed over the 114 years leading up to Callendar’s research. Scientists including Joseph Fourier, Eunice Foote, John Tyndall and Svante Arrhenius had developed an understanding of how water vapor in the Earth’s atmosphere trapped heat, noted that carbon dioxide in the atmosphere also absorbed large quantities of heat and speculated about how increasing fossil fuel use could raise Earth’s temperature and change the climate. However, these scientists spoke only of future possibilities. Callendar showed global warming was already happening. An engineer runs his own climate experiments Callendar received a certificate in mechanics and mathematics from City and Guilds College, London, in 1922 and went to work for his father, a well-known British physicist. The two shared interests in physics, motorcycles, racing and meteorology. Callendar would later join the U.K. Ministry of Supply in armament […]