Carbon dioxide is the only greenhouse gas that has displayed increasing concentrations over the last century.

Name: Carbon dioxide is the only greenhouse gas that has displayed increasing concentrations over the last century.
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Other greenhouse gases such as methane (CH4), nitrous oxide (N2O), and various fluorinated gases have also shown increasing concentrations over the last century, contributing to global warming alongside carbon dioxide (CO2).

Carbon Dioxide Is the Only Greenhouse Gas That Has Displayed