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IrinaVladis [17]
3 years ago
6

The yearly rise and fall of CO2 levels in the atmosphere are

Biology
1 answer:
Elena L [17]3 years ago
7 0
Seasonal use of fossil fuels, human activities are changing the natural greenhouse. Over the last century the burning fossil fuels like coal and oil has increased carbon dioxide in the atmosphere.
Hope this helps!!
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I believe your Answer would be:

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