Question

How does methane act as a greenhouse gas?

Answer 1

Methane $\left({\mathrm{CH}}_4\right)$ is produced as plant matter decomposes and is emitted from landfills, wetlands, and rice fields.

Due to the fact that methane emissions are smaller than Carbon dioxide ($C{O}_2$) emissions, each Methane $\left({\mathrm{CH}}_4\right)$ molecule has 25 times the global warming potential than a Carbon dioxide ($C{O}_2$) molecule, making it a substantial greenhouse gas.

Hence, Methane$\left({\mathrm{CH}}_4\right)$ act as a greenhouse gas.