Green House Effect

When solar radiations fall on the Earth, it is absorbed by Earth. Some part of heat energy is absorbed by the Earth is emitted back into the space. For this, some of the gases in the lower atmosphere act like the glass in a green house i.e. it allow the Sun radiation to pass through them and fall onto the Earth and do not allow the infra-red radiation emitted by the Earth to pass into the space. Some part of heat are trapped by the gases is sent back to the Earth's surface. The heat sent back to the Earth surface and the heat absorbed by the gases heat up the lower atmosphere and the surface of Earth. this Heating of Earth surface is called green house effect. The gases responsible for green house effect are carbon dioxide, methane, water vapor, chlorofluorocarbon carbons(CF Cs), etc.
The major sources of green house gases are various carbon dioxide releasing human activities like burning of fossil fuels(coal, oil, natural gases etc.), industrial activities, automobiles, aircraft, thermal power stations; methane releasing activities like domestic wastage and sewage; chlurofloro carbon releasing activities like burning of foam products,use of spray cans, use of coolant in refrigerators and air conditioners etc. ,deforestation and reduction of ground cover and burning of grass lands and natural oils, forest fire, bio-decomposition of nitrous fertilizers.
When The green gases in the troposphere of the atmosphere absorb the radiations emitted by the Earth, the air around the Earth becomes. In fact this warmth of Earth's atmosphere is necessary for sustaining lives on it. If there were no green house gases, all the heat radiations emitted by the Earth would escape into the space. As a result, the Earth would ve inhospitably cold and life would not exist on it. Therefore, green house effect is very important and responsible for sustaining lives on the Earth.
However, due to the over concentration of green house gases in the atmosphere caused bya human activities, the surface of Earth and the air close to it are overheated. The overheating of the air in the lower surface is the global warming.
green house effect helps in spreading diseases like malaria and filariasis. It helps breeding, growth and spreading of insects. It also increases the temperature of the atmosphere and brings about changes in the rainfall pattern. Global warming evaporates terrestrial water and leads to shortage of drinking water. The yields of crops reduces due to green house effect due to the reduction of soil moisture.
Green house effect can be controlled by increasing forestation and banning deforestation activities, reducing use of fossil fuels, banning use of CF Cs,increasing the efficiencies of internal combustion engines, using unleaded petrol in vehicles and using bio gas.