The first time scientists hypothesized that changes in CO₂ concentrations could cause climatic changes by trapping heat in the lower atmosphere was A) before the U.S.Civil War. B) around the time of World War I. C) around the time of World War II. D) during the 1950s. E) during the 1970s.

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In 1856, Eunice Newton Foote hypothesized that changes in CO2 concentrations could affect climate by trapping heat, which was before the U.S. Civil War.

The First Time Scientists Hypothesized That Changes in CO2 Concentrations

The First Time Scientists Hypothesized That Changes in CO₂ Concentrations