Question

Define global warming and green house effect

Answer 1

Definition Of Global Warming

Among the planets in the Solar System, the earth is the only one that provides the climatic and temperature conditions which are ideal for sustaining different life forms. Other planets either have burning hot or bitterly cold temperatures. It is the greenhouse effect of the earth’s atmosphere which makes life possible on earth. In this section, we will discuss the greenhouse effect and how it is responsible for global warming.
Greenhouse Effect

The sunlight strikes the earth’s atmosphere in the form of visible light, infrared rays, ultraviolet rays and other forms of radiations. Out of the innumerable solar radiations entering the earth, about 30% is reflected back to space by the earth’s atmosphere, clouds, snow and other reflective objects. The remaining incoming solar radiation is absorbed by the earth’s atmosphere, clouds and earth’s surface including oceans, and held back as thermal energy. This heat is re-emitted back in the form of infrared rays which have a longer wavelength. The greenhouse gases in the atmosphere such as water vapor, methane, and carbon dioxide, prevent the infrared rays from escaping and holds them in the atmosphere. They radiate the heat energy, which again reaches the earth’s surface and heat it up. Heat is, thus, trapped inside the earth, keeping it warm.

Answer 2

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global warming The gradual increase in the overall temperature of Earth's atmosphere due to the greenhouse effect. greenhouse effect The warming of Earth's atmosphere due to the buildup of heat-trapping gases, such as carbon dioxide and methane. Scientists refer to these pollutants as greenhouse gases.