- GHGs are gases that trap heat in the atmosphere and contribute to the “greenhouse effect” that raises surface temperature on Earth.
- The five most abundant GHGs in the atmosphere are water vapors, carbon dioxide, methane, nitrous oxide, and ozone.
- Other GHGs include synthetic fluorinated gases such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs).
- GEI is the amount of greenhouse gases (GHG) emitted per unit of product output, such as the quantum of gases released while producing cement.
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