The percentage of CO2 in the atmosphere is:
Correct answer: B. 0.042%
- A. 0.0042%
- B. 0.042%
- C. 4.2%
- D. 42%
Explanation
The concentration of carbon dioxide in the Earth's atmosphere is a small but significant fraction. As of the early 2020s, the concentration is over 400 parts per million (ppm), which is equivalent to approximately 0.042%.
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Atmospheric pollution includes smog, acid rain, greenhouse gases, ozone depletion and the effects of carbon monoxide, sulfur oxides, nitrogen oxides and particulate matter. Water pollution covers sewage, industrial waste, eutrophication and treatment stages, while green chemistry focuses on reducing hazardous substances, waste and energy use through safer, more efficient processes.
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