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HELP. humans have been burning fossil fuels rapidly for the past 250 years. As a result, the amount of atmospheric CO2 has increased by about ___% since the year 1800. A) 20 B) 40 C) 60 D) 80
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HELP.

humans have been burning fossil fuels rapidly for the past 250 years. As a result, the amount of atmospheric CO2 has increased by about ___% since the year 1800.


A) 20


B) 40


C) 60


D) 80

User Yserbius
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Answer: it’s B) 40

Explanation : I took the test.

User Ramakay
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