Question

what is green house effect ? explain.

Answer 1

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere.[1][2]

If a planet's atmosphere contains radiatively active gases (i.e., greenhouse gases) they will radiate energy in all directions. Part of this radiation is directed towards the surface, warming it.[3] The intensity of the downward radiation – that is, the strength of the greenhouse effect – will depend on the atmosphere's temperature and on the amount of greenhouse gases that the atmosphere contains.

Earth’s natural greenhouse effect is critical to supporting life. Human activities, mainly the burning of fossil fuels and clearing of forests, have strengthened the greenhouse effect and caused global warming.[4]

The term "greenhouse effect" arose from a faulty analogy with the effect of sunlight passing through glass and warming a greenhouse. The way a greenhouse retains heat is fundamentally different, as a greenhouse works mostly by reducing airflow so that warm air is kept inside.[

Answer 2

$\huge {\bf{\green{Greenhouse\:Effect}}}$

$\bf{\pink{\green {\sf{A\: greenhouse}}}}$ is made up of glass sheets. The glass allows the Sun's heat to get in but does not allow it to go out. The trapped heat provides the required warmth to the plants in the green- house. The trapping of the heat radiations by the Earth's atmosphere is similar That is why it is called the greenhouse effect.

The Sun's rays (radiations) warm the Earth's surface. A part of the radiations that fall on the Earth is absorbed by it and a part is reflected back into space. A part of the reflected radiations is trapped by the atmosphere. The trapped radiations further warm the Earth. Without this trapping of radiations, enough warmth would not be available in the atmosphere to enable plants and animals survive. But now it threatens life because of too much warming. The reason is extra trapping of radiations by the increased amount of carbon dioxide in the atmosphere due to air pollution.

Deforestation leads to an increase in the amount of carbon dioxide in the air because the number of trees which consume carbon dioxide to make food is reduced. On the other hand, Carbon dioxide is continuously being released because of human activities: running of vehicles and industries. Increased amount of carbon dioxide traps more heat radiations and does not allow it to escape into space. As a result the average temperature of the Earth's atmosphere is gradually increasing. This is called $\bf{\blue{global \:warming}}$ . Other gases like methane, nitrous oxide and water vapour also produce greenhouse effect. Like carbon dioxide, they are also called $\bf{\blue{greenhouse \:gases}}.$

An increase in the earth's temperature by even as little as O.5°C has caused the Gangotri glacier in the Himalayas to start melting.