Greenhouse is referred to as a chamber where plants are grown in a closed warm environment as compared to the outside temperature. This is normally practised in cold region of the hills. The solar radiations bringing heat (in the form of infra-red rays from the sun) are trapped inside the chamber.
The atmosphere on earth can also act in a similar way.
Industrialization and urbanization has lead to deforestation and release of gases, such as CO2, CH4 and N2O into the atmosphere. These gases have converted the earth’s atmosphere into a Greenhouse.
Heat contained in the solar radiations is allowed to come in, but the heat contained in it is not sent back due to increasing concentration of CO2 and other greenhouse gases. As a result, the earth’s average temperature is increasing each year leading to global warming.
Although the increase in global temperature in the last hundred years has been estimated to rise by only 1 degree, it has resulted in serious consequences, such as: