For records prior to the 1950s,where do scientists obtain evidence showing atmospheric concentrations of carbon dioxide?

Question

Quizplus · Accepted Answer

Air bubbles trapped in ice in Greenland and Antarctica are used to examine concentrations of atmospheric gases like carbon dioxide going back thousands of years. This is done by accessing deep ice cores, which contain a continuous record of gas concentrations over time.

For Records Prior to the 1950s,where Do Scientists Obtain Evidence