Question

Climate of the world is threatened by

• A. Increasing amount of atmospheric $C{O}_2$
• B. Decreasing amount of atmospheric $C{O}_2$
• C. Increasing concentration of atmospheric $O_2$
• D. Decreasing amount of atmospheric $O_2$

Answer 1

The correct option is A Increasing amount of atmospheric $C{O}_2$

Carbon dioxide is a naturally occurring gas. It shows greenhouse effect by absorbing the the long-wavelength infra-red radiations coming from the earth's surface and preventing from leaving the atmosphere. This effect is responsible for maintaining the ambient temperature on the earth. However, due to increase in combustion of fossil fuels like petroleum and coal and excessive deforestation, the amount of carbon dioxide has increased over the past years and this has adversely affected the global temperature by raiding it. This is called global warming and is responsible for climate change.

Hence, the correct answer is 'Increasing amount of atmospheric CO${}_2$'