Who first discovered global warming or what group?

greenhouse effect first theorised joseph fourier in 1824.

in 1950's john tyndall experiments showed infrared radiation emitted gasses, providing empirical evidence greenhouse effect

in 1896 svente arrhenius published paper called "on influence of carbonic acid in air upon temperature of ground" in described how radiation emitted co2 molecules influence temperature on earth.

in 1938 callendar published paper called "the artificial production of carbon dioxide , influence on temperature" in estimated how recent warming may have been driven increases in co2 fossil fuel emissions. paper heavily criticised , in retrospect, data unreliable since temperature records in days biased.

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