Question

State the cause of increase of green house effect

Answer 1

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If the earth had no atmosphere, an energy balance between incoming solar radiation and outgoing thermal radiation would be achieved at an earthly surface temperature of about 255K. And the distribution of outgoing radiation would look like a black body. But earth’s actual outgoing radiation does not look like a black body- it contains gaps at many different frequencies. These frequencies correspond to absorption bands due to greenhouse gases, where outgoing radiation is absorbed, then re-radiated in all directions instead of continuing outwards. This effectively traps the energies emitted at these frequencies, so that the net outgoing radiation is less than that of a black body, by about 40%. The net result is that the earth surface temperature must rise to a higher temperature than a black body, in order to achieve thermal equilibrium with the solar input. Some slides in this presentation describe the greenhouse effect, showing specific details about particular gases and absorption bands.

Answer 2

Burning fossil fuels produces huge quantities of carbon dioxide (CO2) which is a greenhouse gas. Carbon dioxide along with other greenhouse gasses such as methane, nitrous oxide and chlorofluorocarbons (CFCs) are changing the composition of the atmosphere and are adding to the greenhouse effect.