Short answers, pulled from the story.
Foote discovered in 1856 that carbon dioxide absorbs more heat from sunlight than other gases, and theorized that a higher proportion of carbon dioxide in the atmosphere would raise the Earth's temperature. Her paper, published in the American Journal of Science and Arts, was the first known scientific publication to connect atmospheric carbon dioxide levels to climate change.
Joseph Henry of the Smithsonian Institution read Foote's paper at the tenth annual meeting of the American Association for the Advancement of Science in Albany, New York. Foote did not present it herself; even women who were members of the AAAS seldom presented their work at conferences.
Foote's 1856 paper preceded Tyndall's first publication on heat absorption by gases by three years, and her observation that differing atmospheric levels of water vapor and carbon dioxide would affect climate preceded his 1861 climate paper by five years. However, Foote's simpler apparatus could not isolate the thermal infrared radiation mechanism that Tyndall's more sophisticated equipment detected.
Foote fell into obscurity because she was a woman, an amateur scientist, and American researchers in physics lacked international standing at the time. Biases against crediting women scientists left her contributions undocumented, and John Tyndall became the person most often credited with discovering the greenhouse effect.
Foote was a signatory of the Declaration of Sentiments and one of five women who prepared the convention's proceedings for publication. The other four were Elizabeth Cady Stanton, Elizabeth M'Clintock, Mary Ann M'Clintock, and Amy Post.
The Eunice Newton Foote Medal for Earth-Life Science was instituted by the American Geophysical Union in 2022 to recognize outstanding scientific research at the convergence of Earth and life science. It was named in honor of Foote's pioneering work identifying the heat-absorbing properties of greenhouse gases.