Discussion
The main Green house gas is
Answer: C
The main greenhouse gas among the options is carbon dioxide.
Carbon dioxide is the most important greenhouse gas released by human activity, from burning fossil fuels and clearing forests, and it accounts for the largest share of the additional warming since industrialisation. Its concentration has risen from about 280 ppm before 1750 to over 420 ppm.
Nitrogen makes up most of the atmosphere but does not absorb infrared radiation, so it is not a greenhouse gas. Chlorine is not a greenhouse gas either, and ozone is a greenhouse gas but a minor one compared with CO2.
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