= Mass conversion in global warming potential
A <global warming potential> compares equal-mass pulses. If $\epsilon_i$ is the <greenhouse gas radiative efficiency> per ppb, an emitted <mass> produces a mixing-ratio increment inversely proportional to <molar mass> $M_i$. For two gases with exponential pulse removal, their GWP ratio at horizon $H$ is $(\epsilon_i/\epsilon_j)(M_j/M_i)\tau_i(1-e^{-H/\tau_i})/[\tau_j(1-e^{-H/\tau_j})]$. The common carbon-dioxide reference integral cancels. Comparing only the per-ppb coefficients would instead compare unequal emitted masses.
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