Question

How is excessive content of $CO_{2}$ responsible for global warming?

Answer 1

i) Carbon dioxide absorbs infrared radiation.

ii) The sun continuously pushes enormous amounts of energy on earth and other planets in the form of light.

iii) The energy absorbed by the earth is released in the form of heat. Without absorbing the heat, the earth throws away all the heat in to the space. So most of the heat absorption occurs in the form of IR radiation

iv) We know that $CO_{2}$ absorbs infrared radiation in the earth and releases excess of heat to the space. This means earth is emitting slightly less energy than it receives from the sun. However, the earth heats up.

Answer 2

Explanation:

CO2 is a green house gas. About 75% of the solar energy reaching the earth is absorbed by the earth's surface. The rest of the heat radiates back to the atmosphere. But the heat radiated by the heated surface cannot pass freely into the space because excessive CO2 in the atmosphere absorb more heat. This results in increase in the average temprature of the atmosphere. This results in increase in the average temprature of the atmosphere. This is known as global warming.

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