How might information about past carbon dioxide concentrations on Earth contribute to scientists' understanding of present carbon dioxide concentrations?

Question

Quizlet Admin · Accepted Answer

Having historical data on the Earth's CO$_2$ concentrations allow scientists to:
\begin{enumerate}
\item reconstruct the past Earth
\item identify key factors for the rise and fall of CO$_2$ concentrations 
\item forecast future CO$_2$ concentrations
\end{enumerate}

How might information about past carbon dioxide concentrations on Earth contribute to scientists' understanding of present carbon dioxide concentrations?

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