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How many percent of carbon dioxide increased in the atmosphere since pre-industrial times?

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How many percent of carbon dioxide increased in the atmosphere since pre-industrial times?

(a) About 10%

(b) About 20%

(c) About 30%

(d) About 40%

I got this question during an interview for a job.

This intriguing question comes from Global Warming in chapter Social Issues and the Environment of Energy Management

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The correct answer is (c) About 30%

The best explanation: The carbon dioxide in the atmosphere has increased about 30% since pre-industrial times. It causing more heat to trapped in the lower atmosphere. Human activities, industrialization and population growth are the main reasons.

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