Answer:
C. Carbon dioxide has increased as a result of increased human activities.
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CO₂ is a gas that composes the atmosphere, but its increase contributes to the greenhouse effect. C)CO₂ has increased as a result of increased human activities.
Carbon dioxide (CO₂) is a gas that, among other gases, composes the atmosphere, mainly the troposphere, which is closest to the Earth.
The balance of this gas in nature is very complex and involves interactions between the atmosphere, the plants, and the oceans.
CO₂ is essential for plants to photosynthesize. Photosynthesis transforms CO₂ into organic compounds and releases oxygen as final products together with carbohydrates.
This gas is not nocive at concentrations between 300 and 500 ppm. However, the current increase in CO₂ is a responsible component of the greenhouse effect involved in global warming and climate change. The rise in CO₂ is possibly the best documented.
The atmospheric increase of CO₂ follows a natural fluctuation trend that has been happening throughout the whole of Earth's history.
It has been proven that the current rise in CO₂ concentration overlaps the expected variation and that the reached levels at the moment exceed the highest past registered levels. This substantial increase must be related to human activities, such as forest destruction, industry, and fossil fuel uses, among many others.
The correct option is C. Carbon dioxide has increased as a result of increased human activities.
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