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Nature lovers, environmentalists, geologists, botanists and governments of all nations are worried because of two words- Greenhouse Effect. The greenhouse effect has laid out the foundation of a mammoth problem called global warming.
Greenhouse effect is the phenomenon which plays a key role in making earth liveable. Without this, there would be just one in a million chances that we would exist in this biosphere. So let us first understand that what is Greenhouse effect?
Greenhouse effect is the process by which greenhouse gasses trap radiations from sun into the atmosphere and then deflects it in all directions. Thus it doesn’t let this warmth escape from the earth. Gasses which help to do this are carbon di oxide, methane, nitrous oxide, chlorofluorocarbons, ozone and water vapour. Most of these gasses are poor absorbers of sun’s harmful radiations but these absorb some radiations and redirect them towards the earth’s surface making it warm.
So how did this phenomenon get the name ‘greenhouse effect’? Basically greenhouses were built in countries with sub-zero or very cold climates. Green house made up of a translucent glass building where the temperature is maintained so that the plants can grow and flower in regulated warm conditions favourable for their growth, which might not be possible if left in harsh and cold outside climate. So 'greenhouse effect' essentially means the trapping of heat to maintain the warmth at a desired temperature.
Similarly, on large scale, the greenhouse gasses trap heat energy from the sun and do not let the good radiations leave the earth’s atmosphere. This forms a blanket of warmth around the earth. If not for this, earth would still be stuck in ice age with everything frozen around.
Whenever we hear about greenhouse effect, it sets off alarm bells in our minds related to the massive problem it gave birth to: Global Warming. Despite that, the greenhouse effect does have some very important advantages for our planet and the biosphere.
For many years human beings have used this technique of greenhouse effect to cultivate crops in cold & arid regions. Almost all seasonal crops were grown by planting them in green houses. Thus, this man made method to harvest crops has been very vital in countries which do not get enough solar energy and are dependent on other countries for food supplies.
The greenhouse gasses also act as a sieve. They filter the harmful ultraviolet radiations from the sun and bounce them back out of the earth’s atmosphere. One such gas doing it is Ozone. In the absence of this gas, human beings will start suffering from fatal skin ailments .The glaring example is the rapid increase in the number of skin cancer patients in Australia. Australia has almost lost its ozone layer so the harmful radiations of the sun are affecting the people in a major way. The longer wave length radiations are absorbed by carbon di oxide. In absence of which the harmful rays of sun would have caused a huge damage to the earth’s atmosphere which would have effected are planet negatively.
The greenhouse effect also helps to maintain the water level of the oceans and seas. It helps in preventing the melting of the polar ice caps thus it helps to regulate the fragile balance in nature.
Another small advantage of the greenhouse effect, but worth a mention is how some energy companies are trying to use these gasses to heat up water in solar powered water heaters. The result being it shows significant dip in energy prices which directly benefits the consumers economically. Similarly, just like greenhouse farming is also proving economical for the consumers who can have access to nutritious fruits and vegetables all year long.
Thus we see that in controlled and regulated amount the greenhouse effect is actually the most important pillar in maintaining life on earth. It is the sole reason how life on earth has been able to survive and flourish. At the same time, if these gasses start increasing in the atmosphere, it will lead to global warming which will eventually prove disastrous to life on earth.
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