Discussion
Which of the following gas is mainly responsible for global warming ?
Answer: A
The gas mainly responsible is carbon dioxide.
Molecule for molecule, methane, nitrous oxide and chlorofluorocarbons trap more heat than \(\mathrm{CO_{2}}\). But carbon dioxide is emitted in vastly greater quantities, mainly by burning fossil fuels and clearing forests, and stays in the atmosphere for a long time, so it accounts for the largest share of the enhanced greenhouse effect, roughly two-thirds of the warming from long-lived greenhouse gases.
Methane is the second most important contributor, and nitrogen dioxide is chiefly a local air pollutant rather than a major greenhouse gas.
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