what is greenhouse effect?
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Answer:
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.[
When sunlight enters a room made up of glass walls and glass roof, the interior heats up. This is because the infra-red rays from the sun which are of smaller wavelength pass through the glass walls but infra-red rays from the interior cannot pass through the glass walls. The temperature of interior rises. This is called greenhouse effect.