Which of the following is NOT a primary green house gas in the earth's atmosphere?
Hydrogen
The primary greenhouse gases in Earth's atmosphere are water vapour (H2O), carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O) and ozone (O3). These molecules absorb and re-emit infrared radiation, trapping heat.
Hydrogen (H2) is a symmetric diatomic molecule with no dipole moment and does not absorb infrared radiation significantly, so it is not a primary greenhouse gas. Methane, ozone and nitrous oxide are all recognised primary GHGs.
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