The Sun gives energy in the form of sunlight to the earth, the Earth surface absorb amount of energy and warm the earth surface. As the Earth absorb lot amount of heat it gives it out in the form of infrared radiation, but the all radiation escape to space and small portion of radiation can be absorb by greenhouse gases present in the atmosphere. Due to gain of radiation the Earth surface gets warmer, if greenhouse gases were not present on the Earth, it would be too cool planet to live.
These greenhouse gases are responsible for creating green house effect on the Earth surface. Increasing in amount of greenhouse gases in the atmosphere would intensify the greenhouse effect resulting climate change and global warming. This is possible due to compounds are made of three or more atoms. This molecular structure permits them to absorb some of the escaping heat and then re-emit it towards the Earth which increases global temperatures.
A greenhouse gas abbreviated as GHG, these are water vapor Methane (CH4), Carbon dioxide (CO2), Nitrous oxide (N2O), Methane (CH4), ozone and Fluorinated gases. In the absence of greenhouse gases, the average temperature of Earth’s surface would be about −18 °C (0 °F) at present it is 15 °C (59 °F).
Major source of these greenhouse gases are the human activities like deforestation, use of synthetic fertilizers, use of fossil fuel which leads to intense increase in these gases in the atmosphere and control these activities in the human hand.