What do you understand by the greenhouse effect? What are the major greenhouse gases?
The warming of the earth due to re-emission of sun’s energy absorbed by the earth followed by its absorption by $$CO_2$$ molecules and $$H_2O$$ vapour present near the earth's surface and then its radiation back to the earth is called the greenhouse effect.
Though $$CO_2$$ is the main gas in the greenhouse effect, there are some other greenhouses gases also like methane, chlorofluorocarbons, ozone, nitrous oxide, and water vapour.