Global Warming And Green House Effect

What is Global Warming?

The definition of global warming is the increase of average temperature(mean temp) on earth. As the earth is getting hotter, disasters are more  frequent these days.Data shows that earth is getting

warmer every year. Out of 20 warmest year on record, 19 are since 1980 and the hottest year ever observed are in recent eight years. The main issue is the fast change in temperature. The cause behind the global warming is greenhouse effect.

What is the Greenhouse Effect?

The sun is the only source of light on our planet. Earth absorbs two third and radiates one third of this radiation energy causing increase in temperature of the earth atmosphere. This process is called greenhouse effect. Basically the greenhouse effect is seen when rays of sun falls on walls and glasses of greenhouse increasing the temperature inside this. Here on our planet our atmosphere works as glass walls, so the things are pretty much different from that case.

The infrared rays coming from sun immediately increases the temperature making atmosphere warm, the reason is that the infrared radiation can be absorbed by the atmosphere. Without this process the earth would have temperature around –18 degree Celsius and it was impossible to survive here.

Nitrogen, Oxygen and Argon makes up 98% of the earth atmosphere but these gases are not capable of absorbing significant amount infrared radiation thus do not contribute any roll in greenhouse effect. The gases like carbon dioxide, ozone, methane, nitrous oxide, chlorofluorocarbon absorbs infrared making atmosphere warm.

Studies indicates that about 2.7 billion years ago there was so much amount of CO2 and methane in earth atmosphere that the average temperature was about 70 degree Celsius and it was impossible to survive. Through bacteria and plants CO2 is slowly changed into oxygen and now the concentration of CO2 in atmosphere is about 0.038% of total. As soon as the concentration of these gases increases the average temperature of earth increases. This is the whole concept behind the greenhouse effect.

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