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Given pie-diagram represents the relative contribution of various greenhouse gases to
\( P \) total global warming. Identify the gases \( P, Q \),

W \( R \) and \( S \).
\begin{tabular}{|c|c|c|c|c|}
\hline & \( \mathbf{P} \) & \( \mathbf{Q} \) & \( \mathbf{R} \) & \multicolumn{2}{|c|}{\( \mathrm{S} \)} \\
\hline \( \mathbf{1} \) & \( \mathrm{N}_{2} \mathrm{O} \) & \( \mathrm{CFCs} \) & \( \mathrm{CO}_{2} \) & Methane \\
\hline \( \mathbf{2} \) & \( \mathrm{N}_{2} \mathrm{O} \) & Methane & \( \mathrm{CFCs}^{2} \) & \( \mathrm{CO}_{2} \) \\
\hline \( \mathbf{3} \) & \( \mathrm{CO}_{2} \) & \( \mathrm{~N}_{2} \mathrm{O} \) & \( \mathrm{CFCs} \) & Methane \\
\hline 4 & \( \mathrm{CO}_{2} \) & \( \mathrm{CFCs}^{20 \%} \) & \( \mathrm{~N}_{2} \mathrm{O} \) & Methane \\
\hline
\end{tabular}
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