Since 1750, about 46 percent of CO2 is increased in the atmosphere.
Co2 gas is considered as Greenhouse effect.
Green house effect : The trapping of the sun's warmth in a lower atmosphere of planet, due to the more and more transparency of the atmosphere to visible radiation from the sun than the infrared radiation which are emitted by the surface of the planet.
Due to greenhouse effect the temperature of earth surface increases.
Many reasons for increase in Greenhouse effect are as follow:
Due to these reason the percentage of CO2 in the atmosphere is increased by 46.
Learn more about greenhouse effect:
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