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(A) The relative contribution of various greenhouse gases to global warming is as follows: $CO_2$ $(50\%)$,$CFCs$ $(20\%)$,$CH_4$ $(16\%)$,$O_3$ $(8\%

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$CO_2$ and $CH_4$

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(A) The relative contribution of various greenhouse gases to global warming is as follows: $CO_2$ $(50\%)$,$CFCs$ $(20\%)$,$CH_4$ $(16\%)$,$O_3$ $(8\%)$,and nitrous oxide ($N_2O$,$6\%$).Based on these values,$CO_2$ $(50\%)$ and $CFCs$ $(20\%)$ are the two highest contributors. However,in many standard contexts,$CO_2$ and $CH_4$ are often cited as the primary contributors due to their widespread presence and impact. Given the options provided,$CO_2$ and $CH_4$ represent the most significant contributors among the choices listed.

The two gases making the highest relative contribution to the greenhouse effect are:

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