What evidence indicates that the rising atmospheric CO 2 levels are caused by the combustion of fossil fuels?

Remember that fossil fuels are made from plants and animals that died many years ago.

What evidence indicates that the rising atmospheric CO 2 levels are caused by the combustion of fossil fuels?

Remember that fossil fuels are made from plants and animals that died many years ago.

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What Evidence Indicates That the Rising Atmospheric CO₂ Levels Are

Question 30

Multiple Choice

What evidence indicates that the rising atmospheric CO₂ levels are caused by the combustion of fossil fuels?

A) Both the average global temperature and the atmospheric CO₂ level have risen.
B) The level of atmospheric moisture has increased.
C) The ¹⁸O/¹⁶O ratio in atmospheric CO₂ is the same as in atmospheric oxygen.
D) The ¹⁴C/¹²C ratio in atmospheric CO₂ is unusually low.

Correct Answer: