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2 pts Question 5 We know that the Carbon used to increase Carbon Dioxide rates over the past 60 years have come from undergro
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Answer #1

As of now there is no indication in spike or change in Argon level.

But due to repeated set up of industries and factories there is a large increase in burning of hydrocarbon(fossil fuel). A byproduct of such emission is Carbon 14 which has increased in last few decades.

A byproduct of volcanic eruption is not C14

So, 3rd option is correct.

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