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Changes in the composition of the atmosphere is an example of____________________

(a) Internal forcing

(b) External forcing

(c) Mid forcing

(d) Gravitational forcing

I got this question during an online exam.

The question is from Global Warming in division Social Issues and the Environment of Energy Management

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Correct option is (b) External forcing

For explanation: The climate system generate random changes in global temperature for years to decades at a time, but long terms changes emanate only from external forcing. Increased in the concentration of greenhouse gases is an example of external forcing including changes in the composition of the atmosphere.

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