Nowadays we can often hear the term 'Greenhouse effect'. Global warming seminars and conferences are being conducted everywhere. Each and everyday we hear debates about these issues in News reports and other media channels. So, actually what is global warming (or Greenhouse effect)?? And why there is a growing concern about these issues??
Greenhouse effect and Global warning are related to each other. Actually, Greenhouse effect is a phenomenon that leads to Global warming. The trapping of infrared solar radiations by earth's atmosphere is known as greenhouse effect. Earth's atmosphere acts as a greenhouse. Actually it’s the atmospheric gases, mainly carbon dioxide, which traps the infrared radiations. This phenomenon keeps our earth warm and prevents it from cooling excessively during nights. It works in the same way as a Green house.
Earth's atmosphere allows small wavelength (high frequency) infrared radiations that are coming from sun, to pass through it. These infrared rays pass through the atmosphere and heats up the earth. When earth gets heated it also starts emitting infrared radiations. Since earth is less hot than sun (many many times), the radiations emitted by it are of large wavelength. The atmosphere does not allow the larger wavelength radiations to pass through it and reflects it back to earth. These again cause heating of earth surface. This whole process is known as Greenhouse effect. Carbon dioxide is a greenhouse gas. More concentration of CO2 in atmosphere will lead to higher rate of infrared ray trapping, which in turn will increase the temperature of earth. This will lead to Global warming. Hence due to Greenhouse Effect the temperature of earth is constantly increasing (Global Warming).
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